231868551 has 8 divisors (see below), whose sum is σ = 312883200. Its totient is φ = 152716472.

The previous prime is 231868501. The next prime is 231868573. The reversal of 231868551 is 155868132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231868551 - 2¹³ = 231860359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231868501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 465351 + ... + 465848.

It is an arithmetic number, because the mean of its divisors is an integer number (39110400).

Almost surely, 2^231868551 is an apocalyptic number.

231868551 is a deficient number, since it is larger than the sum of its proper divisors (81014649).

231868551 is an equidigital number, since it uses as much as digits as its factorization.

231868551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931285.

The product of its digits is 57600, while the sum is 39.

The square root of 231868551 is about 15227.2305755183. The cubic root of 231868551 is about 614.3472935074.

The spelling of 231868551 in words is "two hundred thirty-one million, eight hundred sixty-eight thousand, five hundred fifty-one".