123638607031 has 2 divisors, whose sum is σ = 123638607032. Its totient is φ = 123638607030.

The previous prime is 123638607019. The next prime is 123638607073. The reversal of 123638607031 is 130706836321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123638607031 - 2⁵ = 123638606999 is a prime.

It is a super-2 number, since 2×123638607031² (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 (123638607011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61819303515 + 61819303516.

It is an arithmetic number, because the mean of its divisors is an integer number (61819303516).

Almost surely, 2^123638607031 is an apocalyptic number.

123638607031 is a deficient number, since it is larger than the sum of its proper divisors (1).

123638607031 is an equidigital number, since it uses as much as digits as its factorization.

123638607031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 40.

The spelling of 123638607031 in words is "one hundred twenty-three billion, six hundred thirty-eight million, six hundred seven thousand, thirty-one".