123112013231 has 2 divisors, whose sum is σ = 123112013232. Its totient is φ = 123112013230.

The previous prime is 123112013209. The next prime is 123112013249. The reversal of 123112013231 is 132310211321.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123112013231 - 2²² = 123107818927 is a prime.

It is a super-2 number, since 2×123112013231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123112013131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61556006615 + 61556006616.

It is an arithmetic number, because the mean of its divisors is an integer number (61556006616).

Almost surely, 2^123112013231 is an apocalyptic number.

123112013231 is a deficient number, since it is larger than the sum of its proper divisors (1).

123112013231 is an equidigital number, since it uses as much as digits as its factorization.

123112013231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 123112013231 its reverse (132310211321), we get a palindrome (255422224552).

The spelling of 123112013231 in words is "one hundred twenty-three billion, one hundred twelve million, thirteen thousand, two hundred thirty-one".