13211917 has 2 divisors, whose sum is σ = 13211918. Its totient is φ = 13211916.

The previous prime is 13211903. The next prime is 13211951. The reversal of 13211917 is 71911231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11485321 + 1726596 = 3389^2 + 1314^2 .

It is a cyclic number.

It is not a de Polignac number, because 13211917 - 2⁷ = 13211789 is a prime.

It is equal to p₈₆₂₁₂₆ and since 13211917 and 862126 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 13211891 and 13211900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13211977) 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, 6605958 + 6605959.

It is an arithmetic number, because the mean of its divisors is an integer number (6605959).

Almost surely, 2^13211917 is an apocalyptic number.

It is an amenable number.

13211917 is a deficient number, since it is larger than the sum of its proper divisors (1).

13211917 is an equidigital number, since it uses as much as digits as its factorization.

13211917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 378, while the sum is 25.

The square root of 13211917 is about 3634.8200780781. The cubic root of 13211917 is about 236.4042494629.

The spelling of 13211917 in words is "thirteen million, two hundred eleven thousand, nine hundred seventeen".