520970521 has 2 divisors, whose sum is σ = 520970522. Its totient is φ = 520970520.

The previous prime is 520970509. The next prime is 520970533. The reversal of 520970521 is 125079025.

It is a balanced prime because it is at equal distance from previous prime (520970509) and next prime (520970533).

It can be written as a sum of positive squares in only one way, i.e., 483516121 + 37454400 = 21989^2 + 6120^2 .

It is a cyclic number.

It is not a de Polignac number, because 520970521 - 2⁷ = 520970393 is a prime.

It is a super-2 number, since 2×520970521² = 542820567502022882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (520970581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260485260 + 260485261.

It is an arithmetic number, because the mean of its divisors is an integer number (260485261).

Almost surely, 2^520970521 is an apocalyptic number.

It is an amenable number.

520970521 is a deficient number, since it is larger than the sum of its proper divisors (1).

520970521 is an equidigital number, since it uses as much as digits as its factorization.

520970521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 520970521 is about 22824.7786626727. The cubic root of 520970521 is about 804.6451226957.

The spelling of 520970521 in words is "five hundred twenty million, nine hundred seventy thousand, five hundred twenty-one".