231563885 has 32 divisors (see below), whose sum is σ = 350894592. Its totient is φ = 142940160.

The previous prime is 231563881. The next prime is 231563897. The reversal of 231563885 is 588365132.

It is not a de Polignac number, because 231563885 - 2² = 231563881 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231563881) 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, 5225 + ... + 22145.

It is an arithmetic number, because the mean of its divisors is an integer number (10965456).

Almost surely, 2^231563885 is an apocalyptic number.

It is an amenable number.

231563885 is a deficient number, since it is larger than the sum of its proper divisors (119330707).

231563885 is a wasteful number, since it uses less digits than its factorization.

231563885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16973.

The product of its digits is 172800, while the sum is 41.

The square root of 231563885 is about 15217.2233012465. The cubic root of 231563885 is about 614.0780996475.

The spelling of 231563885 in words is "two hundred thirty-one million, five hundred sixty-three thousand, eight hundred eighty-five".