15796991 has 4 divisors (see below), whose sum is σ = 18053712. Its totient is φ = 13540272.

The previous prime is 15796973. The next prime is 15796993. The reversal of 15796991 is 19969751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19969751 = 37 ⋅539723.

It is a cyclic number.

It is not a de Polignac number, because 15796991 - 2¹⁸ = 15534847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15796993) 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, 1128350 + ... + 1128363.

It is an arithmetic number, because the mean of its divisors is an integer number (4513428).

Almost surely, 2^15796991 is an apocalyptic number.

15796991 is a deficient number, since it is larger than the sum of its proper divisors (2256721).

15796991 is an equidigital number, since it uses as much as digits as its factorization.

15796991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2256720.

The product of its digits is 153090, while the sum is 47.

The square root of 15796991 is about 3974.5428667961. The cubic root of 15796991 is about 250.9139401157.

The spelling of 15796991 in words is "fifteen million, seven hundred ninety-six thousand, nine hundred ninety-one".