123311211977 has 2 divisors, whose sum is σ = 123311211978. Its totient is φ = 123311211976.

The previous prime is 123311211971. The next prime is 123311212027. The reversal of 123311211977 is 779112113321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70736849296 + 52574362681 = 265964^2 + 229291^2 .

It is a cyclic number.

It is not a de Polignac number, because 123311211977 - 2¹² = 123311207881 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123311211977.

It is not a weakly prime, because it can be changed into another prime (123311211971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61655605988 + 61655605989.

It is an arithmetic number, because the mean of its divisors is an integer number (61655605989).

Almost surely, 2^123311211977 is an apocalyptic number.

It is an amenable number.

123311211977 is a deficient number, since it is larger than the sum of its proper divisors (1).

123311211977 is an equidigital number, since it uses as much as digits as its factorization.

123311211977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15876, while the sum is 38.

The spelling of 123311211977 in words is "one hundred twenty-three billion, three hundred eleven million, two hundred eleven thousand, nine hundred seventy-seven".