102131099977 has 2 divisors, whose sum is σ = 102131099978. Its totient is φ = 102131099976.

The previous prime is 102131099953. The next prime is 102131100017. The reversal of 102131099977 is 779990131201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91967234121 + 10163865856 = 303261^2 + 100816^2 .

It is an emirp because it is prime and its reverse (779990131201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102131099977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102131099977.

It is not a weakly prime, because it can be changed into another prime (102131099677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51065549988 + 51065549989.

It is an arithmetic number, because the mean of its divisors is an integer number (51065549989).

Almost surely, 2^102131099977 is an apocalyptic number.

It is an amenable number.

102131099977 is a deficient number, since it is larger than the sum of its proper divisors (1).

102131099977 is an equidigital number, since it uses as much as digits as its factorization.

102131099977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 214326, while the sum is 49.

The spelling of 102131099977 in words is "one hundred two billion, one hundred thirty-one million, ninety-nine thousand, nine hundred seventy-seven".