15171515125087 has 4 divisors (see below), whose sum is σ = 15171525125416. Its totient is φ = 15171505124760.

The previous prime is 15171515125073. The next prime is 15171515125139. The reversal of 15171515125087 is 78052151517151.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 15171515125087 - 2¹⁵ = 15171515092319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15171515125087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15171515195087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2202873 + ... + 5932594.

It is an arithmetic number, because the mean of its divisors is an integer number (3792881281354).

Almost surely, 2^{15171515125087} is an apocalyptic number.

15171515125087 is a deficient number, since it is larger than the sum of its proper divisors (10000329).

15171515125087 is an equidigital number, since it uses as much as digits as its factorization.

15171515125087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10000328.

The product of its (nonzero) digits is 490000, while the sum is 49.

The spelling of 15171515125087 in words is "fifteen trillion, one hundred seventy-one billion, five hundred fifteen million, one hundred twenty-five thousand, eighty-seven".