79960421 has 2 divisors, whose sum is σ = 79960422. Its totient is φ = 79960420.

The previous prime is 79960393. The next prime is 79960423. The reversal of 79960421 is 12406997.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62236321 + 17724100 = 7889^2 + 4210^2 .

It is an emirp because it is prime and its reverse (12406997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79960421 - 2⁶ = 79960357 is a prime.

It is a Sophie Germain prime.

Together with 79960423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79960423) 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, 39980210 + 39980211.

It is an arithmetic number, because the mean of its divisors is an integer number (39980211).

Almost surely, 2^79960421 is an apocalyptic number.

It is an amenable number.

79960421 is a deficient number, since it is larger than the sum of its proper divisors (1).

79960421 is an equidigital number, since it uses as much as digits as its factorization.

79960421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 79960421 is about 8942.0591029136. The cubic root of 79960421 is about 430.8158676425.

The spelling of 79960421 in words is "seventy-nine million, nine hundred sixty thousand, four hundred twenty-one".