231312131 has 4 divisors (see below), whose sum is σ = 231426000. Its totient is φ = 231198264.

The previous prime is 231312121. The next prime is 231312139. The reversal of 231312131 is 131213132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231312131 - 2¹⁰ = 231311107 is a prime.

It is a super-2 number, since 2×231312131² = 107010603895522322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231312139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53831 + ... + 57968.

It is an arithmetic number, because the mean of its divisors is an integer number (57856500).

Almost surely, 2^231312131 is an apocalyptic number.

231312131 is a deficient number, since it is larger than the sum of its proper divisors (113869).

231312131 is a wasteful number, since it uses less digits than its factorization.

231312131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113868.

The product of its digits is 108, while the sum is 17.

The square root of 231312131 is about 15208.9490432442. The cubic root of 231312131 is about 613.8554790417.

Adding to 231312131 its reverse (131213132), we get a palindrome (362525263).

The spelling of 231312131 in words is "two hundred thirty-one million, three hundred twelve thousand, one hundred thirty-one".