1255917831 has 32 divisors (see below), whose sum is σ = 1939611648. Its totient is φ = 708035040.

The previous prime is 1255917827. The next prime is 1255917833. The reversal of 1255917831 is 1387195521.

1255917831 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1255917831 - 2² = 1255917827 is a prime.

It is a super-2 number, since 2×1255917831² = 3154659196447489122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255917833) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 671760 + ... + 673626.

It is an arithmetic number, because the mean of its divisors is an integer number (60612864).

Almost surely, 2^1255917831 is an apocalyptic number.

1255917831 is a deficient number, since it is larger than the sum of its proper divisors (683693817).

1255917831 is a wasteful number, since it uses less digits than its factorization.

1255917831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2291.

The product of its digits is 75600, while the sum is 42.

The square root of 1255917831 is about 35438.9310081441. The cubic root of 1255917831 is about 1078.9146134406.

The spelling of 1255917831 in words is "one billion, two hundred fifty-five million, nine hundred seventeen thousand, eight hundred thirty-one".