13111639 has 2 divisors, whose sum is σ = 13111640. Its totient is φ = 13111638.

The previous prime is 13111627. The next prime is 13111643. The reversal of 13111639 is 93611131.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13111639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13111619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6555819 + 6555820.

It is an arithmetic number, because the mean of its divisors is an integer number (6555820).

Almost surely, 2^13111639 is an apocalyptic number.

13111639 is a deficient number, since it is larger than the sum of its proper divisors (1).

13111639 is an equidigital number, since it uses as much as digits as its factorization.

13111639 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 13111639 is about 3620.9997238332. Note that the first 3 decimals coincide. The cubic root of 13111639 is about 235.8046297965.

The spelling of 13111639 in words is "thirteen million, one hundred eleven thousand, six hundred thirty-nine".