11515631 has 2 divisors, whose sum is σ = 11515632. Its totient is φ = 11515630.

The previous prime is 11515619. The next prime is 11515633. The reversal of 11515631 is 13651511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11515631 - 2¹⁴ = 11499247 is a prime.

It is a super-2 number, since 2×11515631² = 265219514656322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 11515633, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 11515597 and 11515606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11515633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5757815 + 5757816.

It is an arithmetic number, because the mean of its divisors is an integer number (5757816).

Almost surely, 2^11515631 is an apocalyptic number.

11515631 is a deficient number, since it is larger than the sum of its proper divisors (1).

11515631 is an equidigital number, since it uses as much as digits as its factorization.

11515631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 450, while the sum is 23.

The square root of 11515631 is about 3393.4688741758. The cubic root of 11515631 is about 225.8200920268.

The spelling of 11515631 in words is "eleven million, five hundred fifteen thousand, six hundred thirty-one".