11513861 has 2 divisors, whose sum is σ = 11513862. Its totient is φ = 11513860.

The previous prime is 11513851. The next prime is 11513863. The reversal of 11513861 is 16831511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7392961 + 4120900 = 2719^2 + 2030^2 .

It is a cyclic number.

It is not a de Polignac number, because 11513861 - 2⁶ = 11513797 is a prime.

Together with 11513863, it forms a pair of twin primes.

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 11513861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11513863) 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, 5756930 + 5756931.

It is an arithmetic number, because the mean of its divisors is an integer number (5756931).

Almost surely, 2^11513861 is an apocalyptic number.

It is an amenable number.

11513861 is a deficient number, since it is larger than the sum of its proper divisors (1).

11513861 is an equidigital number, since it uses as much as digits as its factorization.

11513861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 26.

The square root of 11513861 is about 3393.2080690697. The cubic root of 11513861 is about 225.8085216073.

The spelling of 11513861 in words is "eleven million, five hundred thirteen thousand, eight hundred sixty-one".