79551971 has 4 divisors (see below), whose sum is σ = 79597944. Its totient is φ = 79506000.

The previous prime is 79551919. The next prime is 79552019. The reversal of 79551971 is 17915597.

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

It is a cyclic number.

It is not a de Polignac number, because 79551971 - 2¹⁸ = 79289827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79551071) 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, 20285 + ... + 23886.

It is an arithmetic number, because the mean of its divisors is an integer number (19899486).

Almost surely, 2^79551971 is an apocalyptic number.

79551971 is a deficient number, since it is larger than the sum of its proper divisors (45973).

79551971 is a wasteful number, since it uses less digits than its factorization.

79551971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45972.

The product of its digits is 99225, while the sum is 44.

The square root of 79551971 is about 8919.1911628802. The cubic root of 79551971 is about 430.0810573712.

The spelling of 79551971 in words is "seventy-nine million, five hundred fifty-one thousand, nine hundred seventy-one".