79618321 has 2 divisors, whose sum is σ = 79618322. Its totient is φ = 79618320.

The previous prime is 79618313. The next prime is 79618367. The reversal of 79618321 is 12381697.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79210000 + 408321 = 8900^2 + 639^2 .

It is an emirp because it is prime and its reverse (12381697) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79618321 - 2³ = 79618313 is a prime.

It is not a weakly prime, because it can be changed into another prime (79618391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39809160 + 39809161.

It is an arithmetic number, because the mean of its divisors is an integer number (39809161).

Almost surely, 2^79618321 is an apocalyptic number.

It is an amenable number.

79618321 is a deficient number, since it is larger than the sum of its proper divisors (1).

79618321 is an equidigital number, since it uses as much as digits as its factorization.

79618321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 79618321 is about 8922.9098953200. The cubic root of 79618321 is about 430.2005932673.

The spelling of 79618321 in words is "seventy-nine million, six hundred eighteen thousand, three hundred twenty-one".