231000031 has 4 divisors (see below), whose sum is σ = 231056064. Its totient is φ = 230944000.

The previous prime is 231000013. The next prime is 231000041. The reversal of 231000031 is 130000132.

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 231000031 - 2⁷ = 230999903 is a prime.

It is a super-2 number, since 2×231000031² = 106722028644001922, 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 = 230999981 and 231000017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231000041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21295 + ... + 30256.

It is an arithmetic number, because the mean of its divisors is an integer number (57764016).

Almost surely, 2^231000031 is an apocalyptic number.

231000031 is a deficient number, since it is larger than the sum of its proper divisors (56033).

231000031 is an equidigital number, since it uses as much as digits as its factorization.

231000031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56032.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 231000031 is about 15198.6851733958. The cubic root of 231000031 is about 613.5792714135.

Adding to 231000031 its reverse (130000132), we get a palindrome (361000163).

The spelling of 231000031 in words is "two hundred thirty-one million, thirty-one", and thus it is an aban number.