722131393 has 2 divisors, whose sum is σ = 722131394. Its totient is φ = 722131392.

The previous prime is 722131381. The next prime is 722131409. The reversal of 722131393 is 393131227.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 587965504 + 134165889 = 24248^2 + 11583^2 .

It is a cyclic number.

It is not a de Polignac number, because 722131393 - 2⁹ = 722130881 is a prime.

It is a super-2 number, since 2×722131393² = 1042947497512240898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (722131303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361065696 + 361065697.

It is an arithmetic number, because the mean of its divisors is an integer number (361065697).

Almost surely, 2^722131393 is an apocalyptic number.

It is an amenable number.

722131393 is a deficient number, since it is larger than the sum of its proper divisors (1).

722131393 is an equidigital number, since it uses as much as digits as its factorization.

722131393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 31.

The square root of 722131393 is about 26872.5025444226. The cubic root of 722131393 is about 897.1644886674.

The spelling of 722131393 in words is "seven hundred twenty-two million, one hundred thirty-one thousand, three hundred ninety-three".