4020701281 has 3 divisors (see below), whose sum is σ = 4020764691. Its totient is φ = 4020637872.

The previous prime is 4020701273. The next prime is 4020701299. The reversal of 4020701281 is 1821070204.

It is a happy number.

The square root of 4020701281 is 63409.

It is a perfect power (a square), and thus also a powerful number.

4020701281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 275261281 + 3745440000 = 16591^2 + 61200^2 .

It is not a de Polignac number, because 4020701281 - 2³ = 4020701273 is a prime.

It is a super-2 number, since 2×4020701281² = 32332077582070081922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4020708281) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 31705 + ... + 95113.

It is an arithmetic number, because the mean of its divisors is an integer number (1340254897).

Almost surely, 2^4020701281 is an apocalyptic number.

4020701281 is the 63409-th square number.

4020701281 is the 31705-th centered octagonal number.

It is an amenable number.

4020701281 is a deficient number, since it is larger than the sum of its proper divisors (63410).

4020701281 is an frugal number, since it uses more digits than its factorization.

4020701281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126818 (or 63409 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The cubic root of 4020701281 is about 1590.1347776789.

Multiplying 4020701281 by its sum of digits (25), we get a square (100517532025 = 317045²).

Adding to 4020701281 its reverse (1821070204), we get a palindrome (5841771485).

The spelling of 4020701281 in words is "four billion, twenty million, seven hundred one thousand, two hundred eighty-one".