521424613 has 2 divisors, whose sum is σ = 521424614. Its totient is φ = 521424612.

The previous prime is 521424577. The next prime is 521424623. The reversal of 521424613 is 316424125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 477772164 + 43652449 = 21858^2 + 6607^2 .

It is a cyclic number.

It is not a de Polignac number, because 521424613 - 2¹³ = 521416421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521424623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260712306 + 260712307.

It is an arithmetic number, because the mean of its divisors is an integer number (260712307).

Almost surely, 2^521424613 is an apocalyptic number.

It is an amenable number.

521424613 is a deficient number, since it is larger than the sum of its proper divisors (1).

521424613 is an equidigital number, since it uses as much as digits as its factorization.

521424613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 28.

The square root of 521424613 is about 22834.7238433050. The cubic root of 521424613 is about 804.8788382903.

Adding to 521424613 its reverse (316424125), we get a palindrome (837848738).

The spelling of 521424613 in words is "five hundred twenty-one million, four hundred twenty-four thousand, six hundred thirteen".