172789289891 has 8 divisors (see below), whose sum is σ = 178465642368. Its totient is φ = 167119344000.

The previous prime is 172789289833. The next prime is 172789289917. The reversal of 172789289891 is 198982987271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172789289891 is a prime.

It is a super-2 number, since 2×172789289891² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172789289591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1546790 + ... + 1654731.

It is an arithmetic number, because the mean of its divisors is an integer number (22308205296).

Almost surely, 2^172789289891 is an apocalyptic number.

172789289891 is a deficient number, since it is larger than the sum of its proper divisors (5676352477).

172789289891 is a wasteful number, since it uses less digits than its factorization.

172789289891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3203293.

The product of its digits is 73156608, while the sum is 71.

The spelling of 172789289891 in words is "one hundred seventy-two billion, seven hundred eighty-nine million, two hundred eighty-nine thousand, eight hundred ninety-one".