123131309999977 has 2 divisors, whose sum is σ = 123131309999978. Its totient is φ = 123131309999976.

The previous prime is 123131309999909. The next prime is 123131310000043. The reversal of 123131309999977 is 779999903131321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109518338940201 + 13612971059776 = 10465101^2 + 3689576^2 .

It is a cyclic number.

It is not a de Polignac number, because 123131309999977 - 2¹¹ = 123131309997929 is a prime.

It is a super-2 number, since 2×123131309999977² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123131309999077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61565654999988 + 61565654999989.

It is an arithmetic number, because the mean of its divisors is an integer number (61565654999989).

Almost surely, 2^{123131309999977} is an apocalyptic number.

It is an amenable number.

123131309999977 is a deficient number, since it is larger than the sum of its proper divisors (1).

123131309999977 is an equidigital number, since it uses as much as digits as its factorization.

123131309999977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 156243654, while the sum is 73.

The spelling of 123131309999977 in words is "one hundred twenty-three trillion, one hundred thirty-one billion, three hundred nine million, nine hundred ninety-nine thousand, nine hundred seventy-seven".