521496729613 has 2 divisors, whose sum is σ = 521496729614. Its totient is φ = 521496729612.

The previous prime is 521496729503. The next prime is 521496729623. The reversal of 521496729613 is 316927694125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 368695483209 + 152801246404 = 607203^2 + 390898^2 .

It is a cyclic number.

It is not a de Polignac number, because 521496729613 - 2²⁹ = 520959858701 is a prime.

It is a super-2 number, since 2×521496729613² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521496729623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260748364806 + 260748364807.

It is an arithmetic number, because the mean of its divisors is an integer number (260748364807).

Almost surely, 2^521496729613 is an apocalyptic number.

It is an amenable number.

521496729613 is a deficient number, since it is larger than the sum of its proper divisors (1).

521496729613 is an equidigital number, since it uses as much as digits as its factorization.

521496729613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 55.

The spelling of 521496729613 in words is "five hundred twenty-one billion, four hundred ninety-six million, seven hundred twenty-nine thousand, six hundred thirteen".