79971801 has 32 divisors (see below), whose sum is σ = 131728128. Its totient is φ = 42024960.

The previous prime is 79971781. The next prime is 79971811. The reversal of 79971801 is 10817997.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-79971801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79971811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 124441 + ... + 125081.

It is an arithmetic number, because the mean of its divisors is an integer number (4116504).

Almost surely, 2^79971801 is an apocalyptic number.

It is an amenable number.

79971801 is a deficient number, since it is larger than the sum of its proper divisors (51756327).

79971801 is a wasteful number, since it uses less digits than its factorization.

79971801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121.

The product of its (nonzero) digits is 31752, while the sum is 42.

The square root of 79971801 is about 8942.6953990394. The cubic root of 79971801 is about 430.8363046368.

The spelling of 79971801 in words is "seventy-nine million, nine hundred seventy-one thousand, eight hundred one".