797458721 has 2 divisors, whose sum is σ = 797458722. Its totient is φ = 797458720.

The previous prime is 797458681. The next prime is 797458777. The reversal of 797458721 is 127854797.

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., 512524321 + 284934400 = 22639^2 + 16880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-797458721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 797458721.

It is not a weakly prime, because it can be changed into another prime (797458021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 398729360 + 398729361.

It is an arithmetic number, because the mean of its divisors is an integer number (398729361).

Almost surely, 2^797458721 is an apocalyptic number.

It is an amenable number.

797458721 is a deficient number, since it is larger than the sum of its proper divisors (1).

797458721 is an equidigital number, since it uses as much as digits as its factorization.

797458721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 987840, while the sum is 50.

The square root of 797458721 is about 28239.3116240464. The cubic root of 797458721 is about 927.3337597016. Note that the first 3 decimals are identical.

The spelling of 797458721 in words is "seven hundred ninety-seven million, four hundred fifty-eight thousand, seven hundred twenty-one".