79221513 has 16 divisors (see below), whose sum is σ = 127820160. Its totient is φ = 42606336.

The previous prime is 79221509. The next prime is 79221557. The reversal of 79221513 is 31512297.

It is not a de Polignac number, because 79221513 - 2² = 79221509 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79221503) 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, 110598 + ... + 111311.

It is an arithmetic number, because the mean of its divisors is an integer number (7988760).

Almost surely, 2^79221513 is an apocalyptic number.

It is an amenable number.

79221513 is a deficient number, since it is larger than the sum of its proper divisors (48598647).

79221513 is a wasteful number, since it uses less digits than its factorization.

79221513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221936.

The product of its digits is 3780, while the sum is 30.

The square root of 79221513 is about 8900.6467742519. The cubic root of 79221513 is about 429.4847135675.

The spelling of 79221513 in words is "seventy-nine million, two hundred twenty-one thousand, five hundred thirteen".