172912271081 has 8 divisors (see below), whose sum is σ = 191828714400. Its totient is φ = 154528685440.

The previous prime is 172912271033. The next prime is 172912271087. The reversal of 172912271081 is 180172219271.

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 172912271081 - 2²² = 172908076777 is a prime.

It is a super-2 number, since 2×172912271081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (172912271087) 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, 133213736 + ... + 133215033.

It is an arithmetic number, because the mean of its divisors is an integer number (23978589300).

Almost surely, 2^172912271081 is an apocalyptic number.

172912271081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

172912271081 is a deficient number, since it is larger than the sum of its proper divisors (18916443319).

172912271081 is a wasteful number, since it uses less digits than its factorization.

172912271081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266428839.

The product of its (nonzero) digits is 28224, while the sum is 41.

The spelling of 172912271081 in words is "one hundred seventy-two billion, nine hundred twelve million, two hundred seventy-one thousand, eighty-one".