798765521 has 2 divisors, whose sum is σ = 798765522. Its totient is φ = 798765520.

The previous prime is 798765497. The next prime is 798765547. The reversal of 798765521 is 125567897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 455182225 + 343583296 = 21335^2 + 18536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-798765521 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 798765521.

It is not a weakly prime, because it can be changed into another prime (798765571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 399382760 + 399382761.

It is an arithmetic number, because the mean of its divisors is an integer number (399382761).

Almost surely, 2^798765521 is an apocalyptic number.

It is an amenable number.

798765521 is a deficient number, since it is larger than the sum of its proper divisors (1).

798765521 is an equidigital number, since it uses as much as digits as its factorization.

798765521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1058400, while the sum is 50.

The square root of 798765521 is about 28262.4401105071. The cubic root of 798765521 is about 927.8400255758.

The spelling of 798765521 in words is "seven hundred ninety-eight million, seven hundred sixty-five thousand, five hundred twenty-one".