521345889 has 45 divisors (see below), whose sum is σ = 811076673. Its totient is φ = 333727128.

The previous prime is 521345849. The next prime is 521345893. The reversal of 521345889 is 988543125.

The square root of 521345889 is 22833.

It is a perfect power (a square), and thus also a powerful number.

521345889 is a `hidden beast` number, since 52 + 13 + 4 + 588 + 9 = 666.

It is not a de Polignac number, because 521345889 - 2¹⁹ = 520821601 is a prime.

Its product of digits (345600) is a multiple of the sum of its prime factors (216).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (521345849) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 8836342 + ... + 8836400.

Almost surely, 2^521345889 is an apocalyptic number.

521345889 is a gapful number since it is divisible by the number (59) formed by its first and last digit.

521345889 is the 22833-rd square number.

521345889 is the 11417-th centered octagonal number.

It is an amenable number.

521345889 is a deficient number, since it is larger than the sum of its proper divisors (289730784).

521345889 is an frugal number, since it uses more digits than its factorization.

521345889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216 (or 105 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The cubic root of 521345889 is about 804.8383297366.

The spelling of 521345889 in words is "five hundred twenty-one million, three hundred forty-five thousand, eight hundred eighty-nine".