79921213 has 4 divisors (see below), whose sum is σ = 80012608. Its totient is φ = 79829820.

The previous prime is 79921211. The next prime is 79921271. The reversal of 79921213 is 31212997.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 79921213 - 2¹ = 79921211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79921211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44373 + ... + 46138.

It is an arithmetic number, because the mean of its divisors is an integer number (20003152).

Almost surely, 2^79921213 is an apocalyptic number.

It is an amenable number.

79921213 is a deficient number, since it is larger than the sum of its proper divisors (91395).

79921213 is an equidigital number, since it uses as much as digits as its factorization.

79921213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91394.

The product of its digits is 6804, while the sum is 34.

The square root of 79921213 is about 8939.8664978846. The cubic root of 79921213 is about 430.7454403405.

The spelling of 79921213 in words is "seventy-nine million, nine hundred twenty-one thousand, two hundred thirteen".