521109892 has 12 divisors (see below), whose sum is σ = 912988300. Its totient is φ = 260256096.

The previous prime is 521109811. The next prime is 521109893. The reversal of 521109892 is 298901125.

It can be written as a sum of positive squares in 2 ways, for example, as 489028996 + 32080896 = 22114^2 + 5664^2 .

It is not an unprimeable number, because it can be changed into a prime (521109893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70767 + ... + 77782.

Almost surely, 2^521109892 is an apocalyptic number.

It is an amenable number.

521109892 is a deficient number, since it is larger than the sum of its proper divisors (391878408).

521109892 is a wasteful number, since it uses less digits than its factorization.

521109892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149430 (or 149428 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 521109892 is about 22827.8315220697. The cubic root of 521109892 is about 804.7168696833.

The spelling of 521109892 in words is "five hundred twenty-one million, one hundred nine thousand, eight hundred ninety-two".