721408801 has 2 divisors, whose sum is σ = 721408802. Its totient is φ = 721408800.

The previous prime is 721408763. The next prime is 721408819. The reversal of 721408801 is 108804127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 696168225 + 25240576 = 26385^2 + 5024^2 .

It is a cyclic number.

It is not a de Polignac number, because 721408801 - 2⁷ = 721408673 is a prime.

It is not a weakly prime, because it can be changed into another prime (721408001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360704400 + 360704401.

It is an arithmetic number, because the mean of its divisors is an integer number (360704401).

Almost surely, 2^721408801 is an apocalyptic number.

It is an amenable number.

721408801 is a deficient number, since it is larger than the sum of its proper divisors (1).

721408801 is an equidigital number, since it uses as much as digits as its factorization.

721408801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 721408801 is about 26859.0543578883. The cubic root of 721408801 is about 896.8651432199.

The spelling of 721408801 in words is "seven hundred twenty-one million, four hundred eight thousand, eight hundred one".