12311977 has 2 divisors, whose sum is σ = 12311978. Its totient is φ = 12311976.

The previous prime is 12311951. The next prime is 12311983. The reversal of 12311977 is 77911321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9865881 + 2446096 = 3141^2 + 1564^2 .

It is an emirp because it is prime and its reverse (77911321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12311977 - 2¹⁹ = 11787689 is a prime.

It is not a weakly prime, because it can be changed into another prime (12311917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6155988 + 6155989.

It is an arithmetic number, because the mean of its divisors is an integer number (6155989).

Almost surely, 2^12311977 is an apocalyptic number.

It is an amenable number.

12311977 is a deficient number, since it is larger than the sum of its proper divisors (1).

12311977 is an equidigital number, since it uses as much as digits as its factorization.

12311977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2646, while the sum is 31.

The square root of 12311977 is about 3508.8426866988. The cubic root of 12311977 is about 230.9099240891.

It can be divided in two parts, 123 and 11977, that added together give a square (12100 = 110²).

The spelling of 12311977 in words is "twelve million, three hundred eleven thousand, nine hundred seventy-seven".