79719973 has 2 divisors, whose sum is σ = 79719974. Its totient is φ = 79719972.

The previous prime is 79719971. The next prime is 79719989. The reversal of 79719973 is 37991797.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77053284 + 2666689 = 8778^2 + 1633^2 .

It is a cyclic number.

It is not a de Polignac number, because 79719973 - 2¹ = 79719971 is a prime.

Together with 79719971, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 79719973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79719971) 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 as a sum of consecutive naturals, namely, 39859986 + 39859987.

It is an arithmetic number, because the mean of its divisors is an integer number (39859987).

Almost surely, 2^79719973 is an apocalyptic number.

It is an amenable number.

79719973 is a deficient number, since it is larger than the sum of its proper divisors (1).

79719973 is an equidigital number, since it uses as much as digits as its factorization.

79719973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 750141, while the sum is 52.

The square root of 79719973 is about 8928.6042022256. The cubic root of 79719973 is about 430.3836003624.

The spelling of 79719973 in words is "seventy-nine million, seven hundred nineteen thousand, nine hundred seventy-three".