891151172571 has 16 divisors (see below), whose sum is σ = 1298589602688. Its totient is φ = 539104238400.

The previous prime is 891151172537. The next prime is 891151172581. The reversal of 891151172571 is 175271151198.

It is a happy number.

It is not a de Polignac number, because 891151172571 - 2³⁹ = 341395358683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 891151172571.

It is not an unprimeable number, because it can be changed into a prime (891151172501) 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, 24666210 + ... + 24702311.

It is an arithmetic number, because the mean of its divisors is an integer number (81161850168).

Almost surely, 2^891151172571 is an apocalyptic number.

891151172571 is a deficient number, since it is larger than the sum of its proper divisors (407438430117).

891151172571 is a wasteful number, since it uses less digits than its factorization.

891151172571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49369082.

The product of its digits is 176400, while the sum is 48.

The spelling of 891151172571 in words is "eight hundred ninety-one billion, one hundred fifty-one million, one hundred seventy-two thousand, five hundred seventy-one".