231312123031 has 4 divisors (see below), whose sum is σ = 252340497864. Its totient is φ = 210283748200.

The previous prime is 231312123019. The next prime is 231312123061. The reversal of 231312123031 is 130321213132.

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 231312123031 - 2⁷ = 231312122903 is a prime.

It is a super-2 number, since 2×231312123031² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231312122993 and 231312123011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231312123061) 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, 10514187400 + ... + 10514187421.

It is an arithmetic number, because the mean of its divisors is an integer number (63085124466).

Almost surely, 2^231312123031 is an apocalyptic number.

231312123031 is a deficient number, since it is larger than the sum of its proper divisors (21028374833).

231312123031 is a wasteful number, since it uses less digits than its factorization.

231312123031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21028374832.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 231312123031 its reverse (130321213132), we get a palindrome (361633336163).

The spelling of 231312123031 in words is "two hundred thirty-one billion, three hundred twelve million, one hundred twenty-three thousand, thirty-one".