521795513 has 2 divisors, whose sum is σ = 521795514. Its totient is φ = 521795512.

The previous prime is 521795509. The next prime is 521795557. The reversal of 521795513 is 315597125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 372760249 + 149035264 = 19307^2 + 12208^2 .

It is a cyclic number.

It is not a de Polignac number, because 521795513 - 2² = 521795509 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (521795563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260897756 + 260897757.

It is an arithmetic number, because the mean of its divisors is an integer number (260897757).

Almost surely, 2^521795513 is an apocalyptic number.

It is an amenable number.

521795513 is a deficient number, since it is larger than the sum of its proper divisors (1).

521795513 is an equidigital number, since it uses as much as digits as its factorization.

521795513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47250, while the sum is 38.

The square root of 521795513 is about 22842.8438028193. The cubic root of 521795513 is about 805.0696353223.

The spelling of 521795513 in words is "five hundred twenty-one million, seven hundred ninety-five thousand, five hundred thirteen".