231140031 has 32 divisors (see below), whose sum is σ = 323066880. Its totient is φ = 146893824.

The previous prime is 231140027. The next prime is 231140033. The reversal of 231140031 is 130041132.

It is not a de Polignac number, because 231140031 - 2² = 231140027 is a prime.

It is a super-2 number, since 2×231140031² = 106851427861361922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231140033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1417956 + ... + 1418118.

It is an arithmetic number, because the mean of its divisors is an integer number (10095840).

Almost surely, 2^231140031 is an apocalyptic number.

231140031 is a deficient number, since it is larger than the sum of its proper divisors (91926849).

231140031 is a wasteful number, since it uses less digits than its factorization.

231140031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 231140031 is about 15203.2901373354. The cubic root of 231140031 is about 613.7032017721.

Adding to 231140031 its reverse (130041132), we get a palindrome (361181163).

The spelling of 231140031 in words is "two hundred thirty-one million, one hundred forty thousand, thirty-one".