15318991291 has 16 divisors (see below), whose sum is σ = 15961851360. Its totient is φ = 14684060160.

The previous prime is 15318991249. The next prime is 15318991307. The reversal of 15318991291 is 19219981351.

It is a cyclic number.

It is not a de Polignac number, because 15318991291 - 2³³ = 6729056699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15318991241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3582931 + ... + 3587203.

It is an arithmetic number, because the mean of its divisors is an integer number (997615710).

Almost surely, 2^15318991291 is an apocalyptic number.

15318991291 is a deficient number, since it is larger than the sum of its proper divisors (642860069).

15318991291 is a wasteful number, since it uses less digits than its factorization.

15318991291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5166.

The product of its digits is 174960, while the sum is 49.

The spelling of 15318991291 in words is "fifteen billion, three hundred eighteen million, nine hundred ninety-one thousand, two hundred ninety-one".