123112031 has 32 divisors (see below), whose sum is σ = 151815168. Its totient is φ = 97574400.

The previous prime is 123112019. The next prime is 123112051. The reversal of 123112031 is 130211321.

It is not a de Polignac number, because 123112031 - 2²² = 118917727 is a prime.

It is a super-2 number, since 2×123112031² = 30313144353889922, 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 = 123111997 and 123112015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123112051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1089431 + ... + 1089543.

It is an arithmetic number, because the mean of its divisors is an integer number (4744224).

Almost surely, 2^123112031 is an apocalyptic number.

123112031 is a deficient number, since it is larger than the sum of its proper divisors (28703137).

123112031 is a wasteful number, since it uses less digits than its factorization.

123112031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 123112031 is about 11095.5861043930. The cubic root of 123112031 is about 497.4699270560.

Adding to 123112031 its reverse (130211321), we get a palindrome (253323352).

The spelling of 123112031 in words is "one hundred twenty-three million, one hundred twelve thousand, thirty-one".