722916581 has 2 divisors, whose sum is σ = 722916582. Its totient is φ = 722916580.

The previous prime is 722916563. The next prime is 722916613. The reversal of 722916581 is 185619227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 721996900 + 919681 = 26870^2 + 959^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-722916581 is a prime.

It is a super-2 number, since 2×722916581² = 1045216766169459122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (722916511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361458290 + 361458291.

It is an arithmetic number, because the mean of its divisors is an integer number (361458291).

Almost surely, 2^722916581 is an apocalyptic number.

It is an amenable number.

722916581 is a deficient number, since it is larger than the sum of its proper divisors (1).

722916581 is an equidigital number, since it uses as much as digits as its factorization.

722916581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 41.

The square root of 722916581 is about 26887.1080817555. The cubic root of 722916581 is about 897.4895392206.

The spelling of 722916581 in words is "seven hundred twenty-two million, nine hundred sixteen thousand, five hundred eighty-one".