231563431 has 16 divisors (see below), whose sum is σ = 266595840. Its totient is φ = 198918720.

The previous prime is 231563429. The next prime is 231563489. The reversal of 231563431 is 134365132.

It is not a de Polignac number, because 231563431 - 2¹ = 231563429 is a prime.

It is a super-2 number, since 2×231563431² = 107243245152983522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231563431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231563401) 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, 95571 + ... + 97963.

It is an arithmetic number, because the mean of its divisors is an integer number (16662240).

Almost surely, 2^231563431 is an apocalyptic number.

231563431 is a deficient number, since it is larger than the sum of its proper divisors (35032409).

231563431 is a wasteful number, since it uses less digits than its factorization.

231563431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2886.

The product of its digits is 6480, while the sum is 28.

The square root of 231563431 is about 15217.2083839317. The cubic root of 231563431 is about 614.0776983304.

The spelling of 231563431 in words is "two hundred thirty-one million, five hundred sixty-three thousand, four hundred thirty-one".