1256460869 has 6 divisors (see below), whose sum is σ = 1260099750. Its totient is φ = 1252832456.

The previous prime is 1256460857. The next prime is 1256460923. The reversal of 1256460869 is 9680646521.

It can be written as a sum of positive squares in only one way, i.e., 866595844 + 389865025 = 29438^2 + 19745^2 .

It is not a de Polignac number, because 1256460869 - 2⁸ = 1256460613 is a prime.

It is a super-2 number, since 2×1256460869² = 3157387830656470322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256460809) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 124007 + ... + 133755.

It is an arithmetic number, because the mean of its divisors is an integer number (210016625).

Almost surely, 2^1256460869 is an apocalyptic number.

It is an amenable number.

1256460869 is a deficient number, since it is larger than the sum of its proper divisors (3638881).

1256460869 is an frugal number, since it uses more digits than its factorization.

1256460869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10467 (or 10108 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 47.

The square root of 1256460869 is about 35446.5917825678. The cubic root of 1256460869 is about 1079.0700926172.

The spelling of 1256460869 in words is "one billion, two hundred fifty-six million, four hundred sixty thousand, eight hundred sixty-nine".