123965131 has 2 divisors, whose sum is σ = 123965132. Its totient is φ = 123965130.

The previous prime is 123965123. The next prime is 123965143. The reversal of 123965131 is 131569321.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123965131 - 2³ = 123965123 is a prime.

It is a super-2 number, since 2×123965131² = 30734707407694322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123965093 and 123965102.

It is not a weakly prime, because it can be changed into another prime (123965161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61982565 + 61982566.

It is an arithmetic number, because the mean of its divisors is an integer number (61982566).

Almost surely, 2^123965131 is an apocalyptic number.

123965131 is a deficient number, since it is larger than the sum of its proper divisors (1).

123965131 is an equidigital number, since it uses as much as digits as its factorization.

123965131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4860, while the sum is 31.

The square root of 123965131 is about 11133.9629512586. The cubic root of 123965131 is about 498.6163492197.

The spelling of 123965131 in words is "one hundred twenty-three million, nine hundred sixty-five thousand, one hundred thirty-one".