521253497 has 2 divisors, whose sum is σ = 521253498. Its totient is φ = 521253496.

The previous prime is 521253461. The next prime is 521253527. The reversal of 521253497 is 794352125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 426463801 + 94789696 = 20651^2 + 9736^2 .

It is a cyclic number.

It is not a de Polignac number, because 521253497 - 2⁶ = 521253433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 521253497.

It is not a weakly prime, because it can be changed into another prime (521253407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260626748 + 260626749.

It is an arithmetic number, because the mean of its divisors is an integer number (260626749).

Almost surely, 2^521253497 is an apocalyptic number.

It is an amenable number.

521253497 is a deficient number, since it is larger than the sum of its proper divisors (1).

521253497 is an equidigital number, since it uses as much as digits as its factorization.

521253497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 38.

The square root of 521253497 is about 22830.9766983368. The cubic root of 521253497 is about 804.7907829175.

The spelling of 521253497 in words is "five hundred twenty-one million, two hundred fifty-three thousand, four hundred ninety-seven".