521889389 has 8 divisors (see below), whose sum is σ = 622377600. Its totient is φ = 427884336.

The previous prime is 521889383. The next prime is 521889413. The reversal of 521889389 is 983988125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 521889389 - 2²⁴ = 505112173 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 521889389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521889383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1620614 + ... + 1620935.

It is an arithmetic number, because the mean of its divisors is an integer number (77797200).

Almost surely, 2^521889389 is an apocalyptic number.

It is an amenable number.

521889389 is a deficient number, since it is larger than the sum of its proper divisors (100488211).

521889389 is a wasteful number, since it uses less digits than its factorization.

521889389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3241579.

The product of its digits is 1244160, while the sum is 53.

The square root of 521889389 is about 22844.8985333706. The cubic root of 521889389 is about 805.1179123346.

The spelling of 521889389 in words is "five hundred twenty-one million, eight hundred eighty-nine thousand, three hundred eighty-nine".