15117791 has 4 divisors (see below), whose sum is σ = 16280712. Its totient is φ = 13954872.

The previous prime is 15117769. The next prime is 15117797. The reversal of 15117791 is 19771151.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19771151 = 809 ⋅24439.

It is a cyclic number.

It is not a de Polignac number, because 15117791 - 2⁶ = 15117727 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 (15117797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 581441 + ... + 581466.

It is an arithmetic number, because the mean of its divisors is an integer number (4070178).

Almost surely, 2^15117791 is an apocalyptic number.

15117791 is a deficient number, since it is larger than the sum of its proper divisors (1162921).

15117791 is a wasteful number, since it uses less digits than its factorization.

15117791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162920.

The product of its digits is 2205, while the sum is 32.

The square root of 15117791 is about 3888.1603619192. The cubic root of 15117791 is about 247.2650751808.

The spelling of 15117791 in words is "fifteen million, one hundred seventeen thousand, seven hundred ninety-one".