79721927 has 2 divisors, whose sum is σ = 79721928. Its totient is φ = 79721926.

The previous prime is 79721923. The next prime is 79721947. The reversal of 79721927 is 72912797.

It is a weak prime.

It is an emirp because it is prime and its reverse (72912797) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79721927 - 2² = 79721923 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79721923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39860963 + 39860964.

It is an arithmetic number, because the mean of its divisors is an integer number (39860964).

Almost surely, 2^79721927 is an apocalyptic number.

79721927 is a deficient number, since it is larger than the sum of its proper divisors (1).

79721927 is an equidigital number, since it uses as much as digits as its factorization.

79721927 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 111132, while the sum is 44.

The square root of 79721927 is about 8928.7136251534. The cubic root of 79721927 is about 430.3871166819.

The spelling of 79721927 in words is "seventy-nine million, seven hundred twenty-one thousand, nine hundred twenty-seven".