1256172967 has 24 divisors (see below), whose sum is σ = 1498862880. Its totient is φ = 1049368320.

The previous prime is 1256172947. The next prime is 1256172997. The reversal of 1256172967 is 7692716521.

It is not a de Polignac number, because 1256172967 - 2⁷ = 1256172839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256172937) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 307603 + ... + 311659.

It is an arithmetic number, because the mean of its divisors is an integer number (62452620).

Almost surely, 2^1256172967 is an apocalyptic number.

1256172967 is a deficient number, since it is larger than the sum of its proper divisors (242689913).

1256172967 is an equidigital number, since it uses as much as digits as its factorization.

1256172967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4231 (or 4224 counting only the distinct ones).

The product of its digits is 317520, while the sum is 46.

The square root of 1256172967 is about 35442.5304824585. The cubic root of 1256172967 is about 1078.9876679335.

The spelling of 1256172967 in words is "one billion, two hundred fifty-six million, one hundred seventy-two thousand, nine hundred sixty-seven".