1255638291 has 32 divisors (see below), whose sum is σ = 1755801600. Its totient is φ = 797264640.

The previous prime is 1255638277. The next prime is 1255638299. The reversal of 1255638291 is 1928365521.

It is not a de Polignac number, because 1255638291 - 2¹¹ = 1255636243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1255638299) 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, 1770645 + ... + 1771353.

It is an arithmetic number, because the mean of its divisors is an integer number (54868800).

Almost surely, 2^1255638291 is an apocalyptic number.

1255638291 is a deficient number, since it is larger than the sum of its proper divisors (500163309).

1255638291 is a wasteful number, since it uses less digits than its factorization.

1255638291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019.

The product of its digits is 129600, while the sum is 42.

The square root of 1255638291 is about 35434.9868209373. The cubic root of 1255638291 is about 1078.8345598567.

The spelling of 1255638291 in words is "one billion, two hundred fifty-five million, six hundred thirty-eight thousand, two hundred ninety-one".