80713921 has 2 divisors, whose sum is σ = 80713922. Its totient is φ = 80713920.

The previous prime is 80713903. The next prime is 80714003. The reversal of 80713921 is 12931708.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79923600 + 790321 = 8940^2 + 889^2 .

It is a cyclic number.

It is not a de Polignac number, because 80713921 - 2⁵ = 80713889 is a prime.

It is not a weakly prime, because it can be changed into another prime (80713901) 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, 40356960 + 40356961.

It is an arithmetic number, because the mean of its divisors is an integer number (40356961).

Almost surely, 2^80713921 is an apocalyptic number.

It is an amenable number.

80713921 is a deficient number, since it is larger than the sum of its proper divisors (1).

80713921 is an equidigital number, since it uses as much as digits as its factorization.

80713921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 80713921 is about 8984.0926642594. The cubic root of 80713921 is about 432.1648908297.

The spelling of 80713921 in words is "eighty million, seven hundred thirteen thousand, nine hundred twenty-one".