79091871 has 16 divisors (see below), whose sum is σ = 116515584. Its totient is φ = 47467904.

The previous prime is 79091867. The next prime is 79091893. The reversal of 79091871 is 17819097.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 79091871 - 2² = 79091867 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79091821) 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, 32541 + ... + 34886.

It is an arithmetic number, because the mean of its divisors is an integer number (7282224).

Almost surely, 2^79091871 is an apocalyptic number.

79091871 is a deficient number, since it is larger than the sum of its proper divisors (37423713).

79091871 is a wasteful number, since it uses less digits than its factorization.

79091871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67470.

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

The square root of 79091871 is about 8893.3610631752. The cubic root of 79091871 is about 429.2503089852.

The spelling of 79091871 in words is "seventy-nine million, ninety-one thousand, eight hundred seventy-one".