521861366 has 16 divisors (see below), whose sum is σ = 863569728. Its totient is φ = 234984000.

The previous prime is 521861341. The next prime is 521861369. The reversal of 521861366 is 663168125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521861369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243710 + ... + 245841.

It is an arithmetic number, because the mean of its divisors is an integer number (53973108).

Almost surely, 2^521861366 is an apocalyptic number.

521861366 is a deficient number, since it is larger than the sum of its proper divisors (341708362).

521861366 is a wasteful number, since it uses less digits than its factorization.

521861366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489607.

The product of its digits is 51840, while the sum is 38.

The square root of 521861366 is about 22844.2851934570. The cubic root of 521861366 is about 805.1035017311.

The spelling of 521861366 in words is "five hundred twenty-one million, eight hundred sixty-one thousand, three hundred sixty-six".