521313997 has 2 divisors, whose sum is σ = 521313998. Its totient is φ = 521313996.

The previous prime is 521313971. The next prime is 521314019. The reversal of 521313997 is 799313125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 296493961 + 224820036 = 17219^2 + 14994^2 .

It is a cyclic number.

It is not a de Polignac number, because 521313997 - 2²³ = 512925389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521313917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260656998 + 260656999.

It is an arithmetic number, because the mean of its divisors is an integer number (260656999).

Almost surely, 2^521313997 is an apocalyptic number.

It is an amenable number.

521313997 is a deficient number, since it is larger than the sum of its proper divisors (1).

521313997 is an equidigital number, since it uses as much as digits as its factorization.

521313997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51030, while the sum is 40.

The square root of 521313997 is about 22832.3016141606. The cubic root of 521313997 is about 804.8219180939.

The spelling of 521313997 in words is "five hundred twenty-one million, three hundred thirteen thousand, nine hundred ninety-seven".