13607991 has 6 divisors (see below), whose sum is σ = 19656000. Its totient is φ = 9071988.

The previous prime is 13607981. The next prime is 13608013. The reversal of 13607991 is 19970631.

It is not a de Polignac number, because 13607991 - 2⁵ = 13607959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13607921) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 755991 + ... + 756008.

It is an arithmetic number, because the mean of its divisors is an integer number (3276000).

Almost surely, 2^13607991 is an apocalyptic number.

13607991 is a deficient number, since it is larger than the sum of its proper divisors (6048009).

13607991 is a wasteful number, since it uses less digits than its factorization.

13607991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512005 (or 1512002 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 13607991 is about 3688.9010558702. The cubic root of 13607991 is about 238.7433798407.

The spelling of 13607991 in words is "thirteen million, six hundred seven thousand, nine hundred ninety-one".