15996191 has 4 divisors (see below), whose sum is σ = 16386384. Its totient is φ = 15606000.

The previous prime is 15996161. The next prime is 15996199. The reversal of 15996191 is 19169951.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19169951 = 239 ⋅80209.

It is a cyclic number.

It is not a de Polignac number, because 15996191 - 2¹⁰ = 15995167 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 390151 = 15996191 / (1 + 5 + 9 + 9 + 6 + 1 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15996199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195035 + ... + 195116.

It is an arithmetic number, because the mean of its divisors is an integer number (4096596).

Almost surely, 2^15996191 is an apocalyptic number.

15996191 is a deficient number, since it is larger than the sum of its proper divisors (390193).

15996191 is an equidigital number, since it uses as much as digits as its factorization.

15996191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390192.

The product of its digits is 21870, while the sum is 41.

The square root of 15996191 is about 3999.5238466597. The cubic root of 15996191 is about 251.9642123950.

The spelling of 15996191 in words is "fifteen million, nine hundred ninety-six thousand, one hundred ninety-one".