79394009 has 2 divisors, whose sum is σ = 79394010. Its totient is φ = 79394008.

The previous prime is 79393957. The next prime is 79394011. The reversal of 79394009 is 90049397.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74011609 + 5382400 = 8603^2 + 2320^2 .

It is an emirp because it is prime and its reverse (90049397) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79394009 - 2¹² = 79389913 is a prime.

Together with 79394011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79394059) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39697004 + 39697005.

It is an arithmetic number, because the mean of its divisors is an integer number (39697005).

Almost surely, 2^79394009 is an apocalyptic number.

It is an amenable number.

79394009 is a deficient number, since it is larger than the sum of its proper divisors (1).

79394009 is an equidigital number, since it uses as much as digits as its factorization.

79394009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 79394009 is about 8910.3315875449. The cubic root of 79394009 is about 429.7962059350.

The spelling of 79394009 in words is "seventy-nine million, three hundred ninety-four thousand, nine".