11971913 has 2 divisors, whose sum is σ = 11971914. Its totient is φ = 11971912.

The previous prime is 11971901. The next prime is 11971943. The reversal of 11971913 is 31917911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9193024 + 2778889 = 3032^2 + 1667^2 .

It is a cyclic number.

It is not a de Polignac number, because 11971913 - 2¹⁸ = 11709769 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11971913.

It is not a weakly prime, because it can be changed into another prime (11971943) 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, 5985956 + 5985957.

It is an arithmetic number, because the mean of its divisors is an integer number (5985957).

Almost surely, 2^11971913 is an apocalyptic number.

It is an amenable number.

11971913 is a deficient number, since it is larger than the sum of its proper divisors (1).

11971913 is an equidigital number, since it uses as much as digits as its factorization.

11971913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1701, while the sum is 32.

The square root of 11971913 is about 3460.0452309182. The cubic root of 11971913 is about 228.7640890324.

The spelling of 11971913 in words is "eleven million, nine hundred seventy-one thousand, nine hundred thirteen".