722045921 has 2 divisors, whose sum is σ = 722045922. Its totient is φ = 722045920.

The previous prime is 722045899. The next prime is 722046001. The reversal of 722045921 is 129540227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 385690321 + 336355600 = 19639^2 + 18340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-722045921 is a prime.

It is not a weakly prime, because it can be changed into another prime (722045021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361022960 + 361022961.

It is an arithmetic number, because the mean of its divisors is an integer number (361022961).

Almost surely, 2^722045921 is an apocalyptic number.

It is an amenable number.

722045921 is a deficient number, since it is larger than the sum of its proper divisors (1).

722045921 is an equidigital number, since it uses as much as digits as its factorization.

722045921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 722045921 is about 26870.9121728311. The cubic root of 722045921 is about 897.1290909223.

It can be divided in two parts, 72204 and 5921, that added together give a 7-th power (78125 = 5⁷).

The spelling of 722045921 in words is "seven hundred twenty-two million, forty-five thousand, nine hundred twenty-one".