722999257 has 2 divisors, whose sum is σ = 722999258. Its totient is φ = 722999256.

The previous prime is 722999161. The next prime is 722999269. The reversal of 722999257 is 752999227.

722999257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 628053721 + 94945536 = 25061^2 + 9744^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-722999257 is a prime.

It is not a weakly prime, because it can be changed into another prime (722999357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361499628 + 361499629.

It is an arithmetic number, because the mean of its divisors is an integer number (361499629).

Almost surely, 2^722999257 is an apocalyptic number.

It is an amenable number.

722999257 is a deficient number, since it is larger than the sum of its proper divisors (1).

722999257 is an equidigital number, since it uses as much as digits as its factorization.

722999257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1428840, while the sum is 52.

The square root of 722999257 is about 26888.6455032603. The cubic root of 722999257 is about 897.5237515666.

The spelling of 722999257 in words is "seven hundred twenty-two million, nine hundred ninety-nine thousand, two hundred fifty-seven".