13085991 has 12 divisors (see below), whose sum is σ = 18941832. Its totient is φ = 8705616.

The previous prime is 13085987. The next prime is 13086019. The reversal of 13085991 is 19958031.

It is a happy number.

It is not a de Polignac number, because 13085991 - 2² = 13085987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13085921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4045 + ... + 6521.

It is an arithmetic number, because the mean of its divisors is an integer number (1578486).

Almost surely, 2^13085991 is an apocalyptic number.

13085991 is a deficient number, since it is larger than the sum of its proper divisors (5855841).

13085991 is a wasteful number, since it uses less digits than its factorization.

13085991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3070 (or 3067 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 13085991 is about 3617.4564268281. The cubic root of 13085991 is about 235.6507750183.

The spelling of 13085991 in words is "thirteen million, eighty-five thousand, nine hundred ninety-one".