15713991 has 12 divisors (see below), whose sum is σ = 23685168. Its totient is φ = 10020384.

The previous prime is 15713983. The next prime is 15714019. The reversal of 15713991 is 19931751.

It is not a de Polignac number, because 15713991 - 2³ = 15713983 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15713921) 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, 37750 + ... + 38163.

It is an arithmetic number, because the mean of its divisors is an integer number (1973764).

Almost surely, 2^15713991 is an apocalyptic number.

15713991 is a deficient number, since it is larger than the sum of its proper divisors (7971177).

15713991 is a wasteful number, since it uses less digits than its factorization.

15713991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75942 (or 75939 counting only the distinct ones).

The product of its digits is 8505, while the sum is 36.

The square root of 15713991 is about 3964.0876630065. The cubic root of 15713991 is about 250.4737204554.

The spelling of 15713991 in words is "fifteen million, seven hundred thirteen thousand, nine hundred ninety-one".