1304256631 has 4 divisors (see below), whose sum is σ = 1304364600. Its totient is φ = 1304148664.

The previous prime is 1304256601. The next prime is 1304256659. The reversal of 1304256631 is 1366524031.

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 is a cyclic number.

It is not a de Polignac number, because 1304256631 - 2⁹ = 1304256119 is a prime.

It is a super-2 number, since 2×1304256631² = 3402170719014940322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1304256593 and 1304256602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1304256601) 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, 33196 + ... + 60913.

It is an arithmetic number, because the mean of its divisors is an integer number (326091150).

Almost surely, 2^1304256631 is an apocalyptic number.

1304256631 is a deficient number, since it is larger than the sum of its proper divisors (107969).

1304256631 is an equidigital number, since it uses as much as digits as its factorization.

1304256631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107968.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 1304256631 is about 36114.4933648528. The cubic root of 1304256631 is about 1092.5827793455.

The spelling of 1304256631 in words is "one billion, three hundred four million, two hundred fifty-six thousand, six hundred thirty-one".