1255914991 has 16 divisors (see below), whose sum is σ = 1333553760. Its totient is φ = 1179480960.

The previous prime is 1255914971. The next prime is 1255915007. The reversal of 1255914991 is 1994195521.

It is a cyclic number.

It is not a de Polignac number, because 1255914991 - 2²³ = 1247526383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255914971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1575405 + ... + 1576201.

It is an arithmetic number, because the mean of its divisors is an integer number (83347110).

Almost surely, 2^1255914991 is an apocalyptic number.

1255914991 is a deficient number, since it is larger than the sum of its proper divisors (77638769).

1255914991 is a wasteful number, since it uses less digits than its factorization.

1255914991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1434.

The product of its digits is 145800, while the sum is 46.

The square root of 1255914991 is about 35438.8909391928. The cubic root of 1255914991 is about 1078.9138001921.

It can be divided in two parts, 1255914 and 991, that added together give a triangular number (1256905 = T₁₅₈₅).

The spelling of 1255914991 in words is "one billion, two hundred fifty-five million, nine hundred fourteen thousand, nine hundred ninety-one".