11971013 has 2 divisors, whose sum is σ = 11971014. Its totient is φ = 11971012.

The previous prime is 11970967. The next prime is 11971033. The reversal of 11971013 is 31017911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11950849 + 20164 = 3457^2 + 142^2 .

It is a cyclic number.

It is not a de Polignac number, because 11971013 - 2⁸ = 11970757 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11971013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11971033) 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, 5985506 + 5985507.

It is an arithmetic number, because the mean of its divisors is an integer number (5985507).

Almost surely, 2^11971013 is an apocalyptic number.

It is an amenable number.

11971013 is a deficient number, since it is larger than the sum of its proper divisors (1).

11971013 is an equidigital number, since it uses as much as digits as its factorization.

11971013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 189, while the sum is 23.

The square root of 11971013 is about 3459.9151723706. The cubic root of 11971013 is about 228.7583563691.

Adding to 11971013 its reverse (31017911), we get a palindrome (42988924).

The spelling of 11971013 in words is "eleven million, nine hundred seventy-one thousand, thirteen".