15915791 has 4 divisors (see below), whose sum is σ = 16852032. Its totient is φ = 14979552.

The previous prime is 15915769. The next prime is 15915797. The reversal of 15915791 is 19751951.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19751951 = 227 ⋅87013.

It is a cyclic number.

It is not a de Polignac number, because 15915791 - 2¹⁸ = 15653647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15915797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 468095 + ... + 468128.

It is an arithmetic number, because the mean of its divisors is an integer number (4213008).

Almost surely, 2^15915791 is an apocalyptic number.

15915791 is a deficient number, since it is larger than the sum of its proper divisors (936241).

15915791 is an equidigital number, since it uses as much as digits as its factorization.

15915791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936240.

The product of its digits is 14175, while the sum is 38.

The square root of 15915791 is about 3989.4599885197. The cubic root of 15915791 is about 251.5413626081.

The spelling of 15915791 in words is "fifteen million, nine hundred fifteen thousand, seven hundred ninety-one".