231256553 has 4 divisors (see below), whose sum is σ = 252279888. Its totient is φ = 210233220.

The previous prime is 231256541. The next prime is 231256561. The reversal of 231256553 is 355652132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231256553 - 2⁸ = 231256297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231256573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10511651 + ... + 10511672.

It is an arithmetic number, because the mean of its divisors is an integer number (63069972).

Almost surely, 2^231256553 is an apocalyptic number.

It is an amenable number.

231256553 is a deficient number, since it is larger than the sum of its proper divisors (21023335).

231256553 is a wasteful number, since it uses less digits than its factorization.

231256553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21023334.

The product of its digits is 27000, while the sum is 32.

The square root of 231256553 is about 15207.1217855319. The cubic root of 231256553 is about 613.8063108572.

The spelling of 231256553 in words is "two hundred thirty-one million, two hundred fifty-six thousand, five hundred fifty-three".