15996691 has 4 divisors (see below), whose sum is σ = 16429072. Its totient is φ = 15564312.

The previous prime is 15996679. The next prime is 15996703. The reversal of 15996691 is 19669951.

15996691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (15996679) and next prime (15996703).

It is a cyclic number.

It is not a de Polignac number, because 15996691 - 2¹⁵ = 15963923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15996671) 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, 216135 + ... + 216208.

It is an arithmetic number, because the mean of its divisors is an integer number (4107268).

Almost surely, 2^15996691 is an apocalyptic number.

15996691 is a deficient number, since it is larger than the sum of its proper divisors (432381).

15996691 is an equidigital number, since it uses as much as digits as its factorization.

15996691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432380.

The product of its digits is 131220, while the sum is 46.

The square root of 15996691 is about 3999.5863536121. The cubic root of 15996691 is about 251.9668376198.

The spelling of 15996691 in words is "fifteen million, nine hundred ninety-six thousand, six hundred ninety-one".