521920537 has 2 divisors, whose sum is σ = 521920538. Its totient is φ = 521920536.

The previous prime is 521920523. The next prime is 521920603. The reversal of 521920537 is 735029125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 477684736 + 44235801 = 21856^2 + 6651^2 .

It is a cyclic number.

It is not a de Polignac number, because 521920537 - 2¹¹ = 521918489 is a prime.

It is not a weakly prime, because it can be changed into another prime (521920507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260960268 + 260960269.

It is an arithmetic number, because the mean of its divisors is an integer number (260960269).

Almost surely, 2^521920537 is an apocalyptic number.

It is an amenable number.

521920537 is a deficient number, since it is larger than the sum of its proper divisors (1).

521920537 is an equidigital number, since it uses as much as digits as its factorization.

521920537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 521920537 is about 22845.5802508932. The cubic root of 521920537 is about 805.1339293389.

The spelling of 521920537 in words is "five hundred twenty-one million, nine hundred twenty thousand, five hundred thirty-seven".