521350836 has 12 divisors (see below), whose sum is σ = 1216485312. Its totient is φ = 173783608.

The previous prime is 521350829. The next prime is 521350859. The reversal of 521350836 is 638053125.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 521350797 and 521350806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21722940 + ... + 21722963.

It is an arithmetic number, because the mean of its divisors is an integer number (101373776).

Almost surely, 2^521350836 is an apocalyptic number.

It is an amenable number.

521350836 is an abundant number, since it is smaller than the sum of its proper divisors (695134476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521350836 is a wasteful number, since it uses less digits than its factorization.

521350836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43445910 (or 43445908 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 521350836 is about 22833.1083297916. The cubic root of 521350836 is about 804.8408754059.

The spelling of 521350836 in words is "five hundred twenty-one million, three hundred fifty thousand, eight hundred thirty-six".