1256923319 has 2 divisors, whose sum is σ = 1256923320. Its totient is φ = 1256923318.

The previous prime is 1256923279. The next prime is 1256923379. The reversal of 1256923319 is 9133296521.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1256923319 is a prime.

It is a super-2 number, since 2×1256923319² = 3159712459691951522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256923379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628461659 + 628461660.

It is an arithmetic number, because the mean of its divisors is an integer number (628461660).

Almost surely, 2^1256923319 is an apocalyptic number.

1256923319 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256923319 is an equidigital number, since it uses as much as digits as its factorization.

1256923319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87480, while the sum is 41.

The square root of 1256923319 is about 35453.1143765960. The cubic root of 1256923319 is about 1079.2024630361.

The spelling of 1256923319 in words is "one billion, two hundred fifty-six million, nine hundred twenty-three thousand, three hundred nineteen".