79237409 has 2 divisors, whose sum is σ = 79237410. Its totient is φ = 79237408.

The previous prime is 79237399. The next prime is 79237421. The reversal of 79237409 is 90473297.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67486225 + 11751184 = 8215^2 + 3428^2 .

It is an emirp because it is prime and its reverse (90473297) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79237409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79237439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39618704 + 39618705.

It is an arithmetic number, because the mean of its divisors is an integer number (39618705).

Almost surely, 2^79237409 is an apocalyptic number.

It is an amenable number.

79237409 is a deficient number, since it is larger than the sum of its proper divisors (1).

79237409 is an equidigital number, since it uses as much as digits as its factorization.

79237409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 79237409 is about 8901.5396982769. The cubic root of 79237409 is about 429.5134373832.

The spelling of 79237409 in words is "seventy-nine million, two hundred thirty-seven thousand, four hundred nine".