79221171 has 4 divisors (see below), whose sum is σ = 105628232. Its totient is φ = 52814112.

The previous prime is 79221137. The next prime is 79221187. The reversal of 79221171 is 17112297.

It is a happy number.

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

It is not a de Polignac number, because 79221171 - 2²³ = 70832563 is a prime.

It is a super-2 number, since 2×79221171² = 12551987869222482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79221971) 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, 13203526 + ... + 13203531.

It is an arithmetic number, because the mean of its divisors is an integer number (26407058).

Almost surely, 2^79221171 is an apocalyptic number.

79221171 is a deficient number, since it is larger than the sum of its proper divisors (26407061).

79221171 is a wasteful number, since it uses less digits than its factorization.

79221171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26407060.

The product of its digits is 1764, while the sum is 30.

The square root of 79221171 is about 8900.6275621441. The cubic root of 79221171 is about 429.4840955368.

The spelling of 79221171 in words is "seventy-nine million, two hundred twenty-one thousand, one hundred seventy-one".