172197340991 has 8 divisors (see below), whose sum is σ = 185453778720. Its totient is φ = 158942401632.

The previous prime is 172197340981. The next prime is 172197341021. The reversal of 172197340991 is 199043791271.

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-172197340991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172197340981) 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, 129980 + ... + 601073.

It is an arithmetic number, because the mean of its divisors is an integer number (23181722340).

Almost surely, 2^172197340991 is an apocalyptic number.

172197340991 is a deficient number, since it is larger than the sum of its proper divisors (13256437729).

172197340991 is a wasteful number, since it uses less digits than its factorization.

172197340991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749185.

The product of its (nonzero) digits is 857304, while the sum is 53.

The spelling of 172197340991 in words is "one hundred seventy-two billion, one hundred ninety-seven million, three hundred forty thousand, nine hundred ninety-one".