521312615497 has 2 divisors, whose sum is σ = 521312615498. Its totient is φ = 521312615496.

The previous prime is 521312615491. The next prime is 521312615567. The reversal of 521312615497 is 794516213125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 376727115961 + 144585499536 = 613781^2 + 380244^2 .

It is a cyclic number.

It is not a de Polignac number, because 521312615497 - 2²⁷ = 521178397769 is a prime.

It is not a weakly prime, because it can be changed into another prime (521312615491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260656307748 + 260656307749.

It is an arithmetic number, because the mean of its divisors is an integer number (260656307749).

Almost surely, 2^521312615497 is an apocalyptic number.

It is an amenable number.

521312615497 is a deficient number, since it is larger than the sum of its proper divisors (1).

521312615497 is an equidigital number, since it uses as much as digits as its factorization.

521312615497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 453600, while the sum is 46.

The spelling of 521312615497 in words is "five hundred twenty-one billion, three hundred twelve million, six hundred fifteen thousand, four hundred ninety-seven".