561200172191 has 16 divisors (see below), whose sum is σ = 591470745600. Its totient is φ = 531787148640.

The previous prime is 561200172187. The next prime is 561200172199. The reversal of 561200172191 is 191271002165.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 561200172191 - 2² = 561200172187 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 (561200172199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 462116 + ... + 1155833.

It is an arithmetic number, because the mean of its divisors is an integer number (36966921600).

Almost surely, 2^561200172191 is an apocalyptic number.

561200172191 is a deficient number, since it is larger than the sum of its proper divisors (30270573409).

561200172191 is a wasteful number, since it uses less digits than its factorization.

561200172191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1618214.

The product of its (nonzero) digits is 7560, while the sum is 35.

The spelling of 561200172191 in words is "five hundred sixty-one billion, two hundred million, one hundred seventy-two thousand, one hundred ninety-one".