231115131 has 24 divisors (see below), whose sum is σ = 360718176. Its totient is φ = 141747840.

The previous prime is 231115097. The next prime is 231115133. The reversal of 231115131 is 131511132.

It is not a de Polignac number, because 231115131 - 2⁹ = 231114619 is a prime.

It is a super-2 number, since 2×231115131² = 106828407554294322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231115133) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33466 + ... + 39776.

It is an arithmetic number, because the mean of its divisors is an integer number (15029924).

Almost surely, 2^231115131 is an apocalyptic number.

231115131 is a deficient number, since it is larger than the sum of its proper divisors (129603045).

231115131 is a wasteful number, since it uses less digits than its factorization.

231115131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6643 (or 6640 counting only the distinct ones).

The product of its digits is 90, while the sum is 18.

The square root of 231115131 is about 15202.4712135889. The cubic root of 231115131 is about 613.6811635320.

Adding to 231115131 its reverse (131511132), we get a palindrome (362626263).

The spelling of 231115131 in words is "two hundred thirty-one million, one hundred fifteen thousand, one hundred thirty-one".