79329409 has 2 divisors, whose sum is σ = 79329410. Its totient is φ = 79329408.

The previous prime is 79329401. The next prime is 79329449. The reversal of 79329409 is 90492397.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77088400 + 2241009 = 8780^2 + 1497^2 .

It is a cyclic number.

It is not a de Polignac number, because 79329409 - 2³ = 79329401 is a prime.

It is not a weakly prime, because it can be changed into another prime (79329401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39664704 + 39664705.

It is an arithmetic number, because the mean of its divisors is an integer number (39664705).

Almost surely, 2^79329409 is an apocalyptic number.

It is an amenable number.

79329409 is a deficient number, since it is larger than the sum of its proper divisors (1).

79329409 is an equidigital number, since it uses as much as digits as its factorization.

79329409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 79329409 is about 8906.7058444747. The cubic root of 79329409 is about 429.6796044892.

The spelling of 79329409 in words is "seventy-nine million, three hundred twenty-nine thousand, four hundred nine".