171092739987 has 24 divisors (see below), whose sum is σ = 266808036768. Its totient is φ = 105025248000.

The previous prime is 171092739973. The next prime is 171092740031. The reversal of 171092739987 is 789937290171.

It is a happy number.

It is not a de Polignac number, because 171092739987 - 2¹⁰ = 171092738963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (171092739967) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1776439 + ... + 1870272.

It is an arithmetic number, because the mean of its divisors is an integer number (11117001532).

Almost surely, 2^171092739987 is an apocalyptic number.

171092739987 is a deficient number, since it is larger than the sum of its proper divisors (95715296781).

171092739987 is a wasteful number, since it uses less digits than its factorization.

171092739987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3647131 (or 3647128 counting only the distinct ones).

The product of its (nonzero) digits is 12002256, while the sum is 63.

The spelling of 171092739987 in words is "one hundred seventy-one billion, ninety-two million, seven hundred thirty-nine thousand, nine hundred eighty-seven".