11391631 has 2 divisors, whose sum is σ = 11391632. Its totient is φ = 11391630.

The previous prime is 11391623. The next prime is 11391637. The reversal of 11391631 is 13619311.

It is a happy number.

11391631 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11391631 - 2³ = 11391623 is a prime.

It is a super-2 number, since 2×11391631² = 259538513680322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11391596 and 11391605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11391637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5695815 + 5695816.

It is an arithmetic number, because the mean of its divisors is an integer number (5695816).

Almost surely, 2^11391631 is an apocalyptic number.

11391631 is a deficient number, since it is larger than the sum of its proper divisors (1).

11391631 is an equidigital number, since it uses as much as digits as its factorization.

11391631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 486, while the sum is 25.

The square root of 11391631 is about 3375.1490337465. The cubic root of 11391631 is about 225.0066236733.

The spelling of 11391631 in words is "eleven million, three hundred ninety-one thousand, six hundred thirty-one".