971979591 has 16 divisors (see below), whose sum is σ = 1429678080. Its totient is φ = 582457920.

The previous prime is 971979559. The next prime is 971979647. The reversal of 971979591 is 195979179.

It is not a de Polignac number, because 971979591 - 2⁵ = 971979559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (971979191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162535 + ... + 168408.

It is an arithmetic number, because the mean of its divisors is an integer number (89354880).

Almost surely, 2^971979591 is an apocalyptic number.

971979591 is a deficient number, since it is larger than the sum of its proper divisors (457698489).

971979591 is a wasteful number, since it uses less digits than its factorization.

971979591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331046.

The product of its digits is 1607445, while the sum is 57.

The square root of 971979591 is about 31176.5872250315. The cubic root of 971979591 is about 990.5712415918.

The spelling of 971979591 in words is "nine hundred seventy-one million, nine hundred seventy-nine thousand, five hundred ninety-one".