15171919987 has 8 divisors (see below), whose sum is σ = 17342747136. Its totient is φ = 13001945352.

The previous prime is 15171919951. The next prime is 15171919993. The reversal of 15171919987 is 78991917151.

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 15171919987 - 2²⁷ = 15037702259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15171919687) 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 7 ways as a sum of consecutive naturals, for example, 174523 + ... + 246580.

It is an arithmetic number, because the mean of its divisors is an integer number (2167843392).

Almost surely, 2^15171919987 is an apocalyptic number.

15171919987 is a deficient number, since it is larger than the sum of its proper divisors (2170827149).

15171919987 is an equidigital number, since it uses as much as digits as its factorization.

15171919987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426257.

The product of its digits is 1428840, while the sum is 58.

The spelling of 15171919987 in words is "fifteen billion, one hundred seventy-one million, nine hundred nineteen thousand, nine hundred eighty-seven".