79223909 has 2 divisors, whose sum is σ = 79223910. Its totient is φ = 79223908.

The previous prime is 79223899. The next prime is 79223981. The reversal of 79223909 is 90932297.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76073284 + 3150625 = 8722^2 + 1775^2 .

It is an emirp because it is prime and its reverse (90932297) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79223909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79222909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39611954 + 39611955.

It is an arithmetic number, because the mean of its divisors is an integer number (39611955).

Almost surely, 2^79223909 is an apocalyptic number.

It is an amenable number.

79223909 is a deficient number, since it is larger than the sum of its proper divisors (1).

79223909 is an equidigital number, since it uses as much as digits as its factorization.

79223909 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 79223909 is about 8900.7813701944. The cubic root of 79223909 is about 429.4890433468.

The spelling of 79223909 in words is "seventy-nine million, two hundred twenty-three thousand, nine hundred nine".