521939513 has 2 divisors, whose sum is σ = 521939514. Its totient is φ = 521939512.

The previous prime is 521939507. The next prime is 521939527. The reversal of 521939513 is 315939125.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 421398784 + 100540729 = 20528^2 + 10027^2 .

It is a cyclic number.

It is not a de Polignac number, because 521939513 - 2⁴ = 521939497 is a prime.

It is equal to p_27449183 and since 521939513 and 27449183 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (521939533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260969756 + 260969757.

It is an arithmetic number, because the mean of its divisors is an integer number (260969757).

Almost surely, 2^521939513 is an apocalyptic number.

It is an amenable number.

521939513 is a deficient number, since it is larger than the sum of its proper divisors (1).

521939513 is an equidigital number, since it uses as much as digits as its factorization.

521939513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36450, while the sum is 38.

The square root of 521939513 is about 22845.9955572087. The cubic root of 521939513 is about 805.1436869139.

The spelling of 521939513 in words is "five hundred twenty-one million, nine hundred thirty-nine thousand, five hundred thirteen".