11997913 has 2 divisors, whose sum is σ = 11997914. Its totient is φ = 11997912.

The previous prime is 11997901. The next prime is 11997917. The reversal of 11997913 is 31979911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7683984 + 4313929 = 2772^2 + 2077^2 .

It is a cyclic number.

It is not a de Polignac number, because 11997913 - 2¹³ = 11989721 is a prime.

It is not a weakly prime, because it can be changed into another prime (11997917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5998956 + 5998957.

It is an arithmetic number, because the mean of its divisors is an integer number (5998957).

Almost surely, 2^11997913 is an apocalyptic number.

It is an amenable number.

11997913 is a deficient number, since it is larger than the sum of its proper divisors (1).

11997913 is an equidigital number, since it uses as much as digits as its factorization.

11997913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15309, while the sum is 40.

The square root of 11997913 is about 3463.8003695363. The cubic root of 11997913 is about 228.9295754155.

The spelling of 11997913 in words is "eleven million, nine hundred ninety-seven thousand, nine hundred thirteen".