13211977 has 2 divisors, whose sum is σ = 13211978. Its totient is φ = 13211976.

The previous prime is 13211969. The next prime is 13211993. The reversal of 13211977 is 77911231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8649481 + 4562496 = 2941^2 + 2136^2 .

It is an emirp because it is prime and its reverse (77911231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13211977 - 2³ = 13211969 is a prime.

It is not a weakly prime, because it can be changed into another prime (13211917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6605988 + 6605989.

It is an arithmetic number, because the mean of its divisors is an integer number (6605989).

Almost surely, 2^13211977 is an apocalyptic number.

It is an amenable number.

13211977 is a deficient number, since it is larger than the sum of its proper divisors (1).

13211977 is an equidigital number, since it uses as much as digits as its factorization.

13211977 is an odious number, because the sum of its binary digits is odd.

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

The square root of 13211977 is about 3634.8283315722. The cubic root of 13211977 is about 236.4046073275.

The spelling of 13211977 in words is "thirteen million, two hundred eleven thousand, nine hundred seventy-seven".