1801313281 has 4 divisors (see below), whose sum is σ = 1812786772. Its totient is φ = 1789839792.

The previous prime is 1801313237. The next prime is 1801313309. The reversal of 1801313281 is 1823131081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 706762225 + 1094551056 = 26585^2 + 33084^2 .

It is a cyclic number.

It is not a de Polignac number, because 1801313281 - 2⁷ = 1801313153 is a prime.

It is a super-2 number, since 2×1801313281² = 6489459072613969922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1801313581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5736510 + ... + 5736823.

It is an arithmetic number, because the mean of its divisors is an integer number (453196693).

Almost surely, 2^1801313281 is an apocalyptic number.

It is an amenable number.

1801313281 is a deficient number, since it is larger than the sum of its proper divisors (11473491).

1801313281 is a wasteful number, since it uses less digits than its factorization.

1801313281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11473490.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 1801313281 is about 42441.8812141969. The cubic root of 1801313281 is about 1216.7361657262.

The spelling of 1801313281 in words is "one billion, eight hundred one million, three hundred thirteen thousand, two hundred eighty-one".