979441891 has 4 divisors (see below), whose sum is σ = 981163800. Its totient is φ = 977719984.

The previous prime is 979441873. The next prime is 979441951. The reversal of 979441891 is 198144979.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-979441891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (979441871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 860101 + ... + 861238.

It is an arithmetic number, because the mean of its divisors is an integer number (245290950).

Almost surely, 2^979441891 is an apocalyptic number.

979441891 is a deficient number, since it is larger than the sum of its proper divisors (1721909).

979441891 is a wasteful number, since it uses less digits than its factorization.

979441891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721908.

The product of its digits is 653184, while the sum is 52.

The square root of 979441891 is about 31296.0363464768. The cubic root of 979441891 is about 993.0997936654.

The spelling of 979441891 in words is "nine hundred seventy-nine million, four hundred forty-one thousand, eight hundred ninety-one".