12391913 has 2 divisors, whose sum is σ = 12391914. Its totient is φ = 12391912.

The previous prime is 12391867. The next prime is 12391927. The reversal of 12391913 is 31919321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12306064 + 85849 = 3508^2 + 293^2 .

It is a cyclic number.

It is not a de Polignac number, because 12391913 - 2¹⁸ = 12129769 is a prime.

It is equal to p₈₁₂₀₉₉ and since 12391913 and 812099 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (15391913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6195956 + 6195957.

It is an arithmetic number, because the mean of its divisors is an integer number (6195957).

Almost surely, 2^12391913 is an apocalyptic number.

It is an amenable number.

12391913 is a deficient number, since it is larger than the sum of its proper divisors (1).

12391913 is an equidigital number, since it uses as much as digits as its factorization.

12391913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1458, while the sum is 29.

The square root of 12391913 is about 3520.2149082123. The cubic root of 12391913 is about 231.4085770861.

The spelling of 12391913 in words is "twelve million, three hundred ninety-one thousand, nine hundred thirteen".