521752991 has 2 divisors, whose sum is σ = 521752992. Its totient is φ = 521752990.

The previous prime is 521752961. The next prime is 521753027. The reversal of 521752991 is 199257125.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521752991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521752951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260876495 + 260876496.

It is an arithmetic number, because the mean of its divisors is an integer number (260876496).

Almost surely, 2^521752991 is an apocalyptic number.

521752991 is a deficient number, since it is larger than the sum of its proper divisors (1).

521752991 is an equidigital number, since it uses as much as digits as its factorization.

521752991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56700, while the sum is 41.

The square root of 521752991 is about 22841.9130328438. The cubic root of 521752991 is about 805.0477658989.

The spelling of 521752991 in words is "five hundred twenty-one million, seven hundred fifty-two thousand, nine hundred ninety-one".