521898953 has 2 divisors, whose sum is σ = 521898954. Its totient is φ = 521898952.

The previous prime is 521898943. The next prime is 521898977. The reversal of 521898953 is 359898125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 336612409 + 185286544 = 18347^2 + 13612^2 .

It is a cyclic number.

It is not a de Polignac number, because 521898953 - 2⁶ = 521898889 is a prime.

It is not a weakly prime, because it can be changed into another prime (521898943) 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, 260949476 + 260949477.

It is an arithmetic number, because the mean of its divisors is an integer number (260949477).

Almost surely, 2^521898953 is an apocalyptic number.

It is an amenable number.

521898953 is a deficient number, since it is larger than the sum of its proper divisors (1).

521898953 is an equidigital number, since it uses as much as digits as its factorization.

521898953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 777600, while the sum is 50.

The square root of 521898953 is about 22845.1078570446. The cubic root of 521898953 is about 805.1228304270.

The spelling of 521898953 in words is "five hundred twenty-one million, eight hundred ninety-eight thousand, nine hundred fifty-three".