872191061 has 4 divisors (see below), whose sum is σ = 996789792. Its totient is φ = 747592332.

The previous prime is 872191043. The next prime is 872191087. The reversal of 872191061 is 160191278.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 872191061 - 2²⁶ = 805082197 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 (872191961) 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 3 ways as a sum of consecutive naturals, for example, 62299355 + ... + 62299368.

It is an arithmetic number, because the mean of its divisors is an integer number (249197448).

Almost surely, 2^872191061 is an apocalyptic number.

It is an amenable number.

872191061 is a deficient number, since it is larger than the sum of its proper divisors (124598731).

872191061 is a wasteful number, since it uses less digits than its factorization.

872191061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124598730.

The product of its (nonzero) digits is 6048, while the sum is 35.

The square root of 872191061 is about 29532.8810142187. The cubic root of 872191061 is about 955.4410071756.

The spelling of 872191061 in words is "eight hundred seventy-two million, one hundred ninety-one thousand, sixty-one".