521670497 has 2 divisors, whose sum is σ = 521670498. Its totient is φ = 521670496.

The previous prime is 521670493. The next prime is 521670529. The reversal of 521670497 is 794076125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 519885601 + 1784896 = 22801^2 + 1336^2 .

It is a cyclic number.

It is not a de Polignac number, because 521670497 - 2² = 521670493 is a prime.

It is not a weakly prime, because it can be changed into another prime (521670491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260835248 + 260835249.

It is an arithmetic number, because the mean of its divisors is an integer number (260835249).

Almost surely, 2^521670497 is an apocalyptic number.

It is an amenable number.

521670497 is a deficient number, since it is larger than the sum of its proper divisors (1).

521670497 is an equidigital number, since it uses as much as digits as its factorization.

521670497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 521670497 is about 22840.1072020251. The cubic root of 521670497 is about 805.0053351498.

The spelling of 521670497 in words is "five hundred twenty-one million, six hundred seventy thousand, four hundred ninety-seven".