79237421 has 2 divisors, whose sum is σ = 79237422. Its totient is φ = 79237420.

The previous prime is 79237409. The next prime is 79237423. The reversal of 79237421 is 12473297.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72420100 + 6817321 = 8510^2 + 2611^2 .

It is an emirp because it is prime and its reverse (12473297) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79237421 - 2¹⁸ = 78975277 is a prime.

Together with 79237423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79237423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39618710 + 39618711.

It is an arithmetic number, because the mean of its divisors is an integer number (39618711).

Almost surely, 2^79237421 is an apocalyptic number.

It is an amenable number.

79237421 is a deficient number, since it is larger than the sum of its proper divisors (1).

79237421 is an equidigital number, since it uses as much as digits as its factorization.

79237421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 35.

The square root of 79237421 is about 8901.5403723176. The cubic root of 79237421 is about 429.5134590656.

The spelling of 79237421 in words is "seventy-nine million, two hundred thirty-seven thousand, four hundred twenty-one".