15117691 has 8 divisors (see below), whose sum is σ = 15695424. Its totient is φ = 14550720.

The previous prime is 15117659. The next prime is 15117701. The reversal of 15117691 is 19671151.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15117691 - 2⁵ = 15117659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15117611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231 + ... + 5503.

It is an arithmetic number, because the mean of its divisors is an integer number (1961928).

Almost surely, 2^15117691 is an apocalyptic number.

15117691 is a deficient number, since it is larger than the sum of its proper divisors (577733).

15117691 is an equidigital number, since it uses as much as digits as its factorization.

15117691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5381.

The product of its digits is 1890, while the sum is 31.

The square root of 15117691 is about 3888.1475023461. The cubic root of 15117691 is about 247.2645299830.

The spelling of 15117691 in words is "fifteen million, one hundred seventeen thousand, six hundred ninety-one".