1420625281 has 4 divisors (see below), whose sum is σ = 1504191492. Its totient is φ = 1337059072.

The previous prime is 1420625273. The next prime is 1420625293. The reversal of 1420625281 is 1825260241.

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 548309056 + 872316225 = 23416^2 + 29535^2 .

It is a cyclic number.

It is not a de Polignac number, because 1420625281 - 2³ = 1420625273 is a prime.

It is a super-2 number, since 2×1420625281² = 4036352378032657922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1420625681) 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, 41783080 + ... + 41783113.

It is an arithmetic number, because the mean of its divisors is an integer number (376047873).

Almost surely, 2^1420625281 is an apocalyptic number.

It is an amenable number.

1420625281 is a deficient number, since it is larger than the sum of its proper divisors (83566211).

1420625281 is an equidigital number, since it uses as much as digits as its factorization.

1420625281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83566210.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 1420625281 is about 37691.1830671312. The cubic root of 1420625281 is about 1124.1558193088.

The spelling of 1420625281 in words is "one billion, four hundred twenty million, six hundred twenty-five thousand, two hundred eighty-one".