231671131 has 16 divisors (see below), whose sum is σ = 241008768. Its totient is φ = 222566400.

The previous prime is 231671129. The next prime is 231671149. The reversal of 231671131 is 131176132.

It is a cyclic number.

It is not a de Polignac number, because 231671131 - 2¹ = 231671129 is a prime.

It is a super-2 number, since 2×231671131² = 107343025877638322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231671096 and 231671105.

It is not an unprimeable number, because it can be changed into a prime (231671101) 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, 961171 + ... + 961411.

It is an arithmetic number, because the mean of its divisors is an integer number (15063048).

Almost surely, 2^231671131 is an apocalyptic number.

231671131 is a deficient number, since it is larger than the sum of its proper divisors (9337637).

231671131 is a wasteful number, since it uses less digits than its factorization.

231671131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582.

The product of its digits is 756, while the sum is 25.

The square root of 231671131 is about 15220.7467293822. The cubic root of 231671131 is about 614.1728859531.

The spelling of 231671131 in words is "two hundred thirty-one million, six hundred seventy-one thousand, one hundred thirty-one".