79649321 has 2 divisors, whose sum is σ = 79649322. Its totient is φ = 79649320.

The previous prime is 79649309. The next prime is 79649327. The reversal of 79649321 is 12394697.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72863296 + 6786025 = 8536^2 + 2605^2 .

It is a cyclic number.

It is not a de Polignac number, because 79649321 - 2⁶ = 79649257 is a prime.

It is a super-2 number, since 2×79649321² = 12688028671522082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79649327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39824660 + 39824661.

It is an arithmetic number, because the mean of its divisors is an integer number (39824661).

Almost surely, 2^79649321 is an apocalyptic number.

It is an amenable number.

79649321 is a deficient number, since it is larger than the sum of its proper divisors (1).

79649321 is an equidigital number, since it uses as much as digits as its factorization.

79649321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 41.

The square root of 79649321 is about 8924.6468277462. The cubic root of 79649321 is about 430.2564199821.

The spelling of 79649321 in words is "seventy-nine million, six hundred forty-nine thousand, three hundred twenty-one".