521718834 has 64 divisors (see below), whose sum is σ = 1351848960. Its totient is φ = 130351680.

The previous prime is 521718781. The next prime is 521718859. The reversal of 521718834 is 438817125.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 521718792 and 521718801.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14772 + ... + 35519.

It is an arithmetic number, because the mean of its divisors is an integer number (21122640).

Almost surely, 2^521718834 is an apocalyptic number.

521718834 is an abundant number, since it is smaller than the sum of its proper divisors (830130126).

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

521718834 is a wasteful number, since it uses less digits than its factorization.

521718834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50335.

The product of its digits is 53760, while the sum is 39.

The square root of 521718834 is about 22841.1653380470. The cubic root of 521718834 is about 805.0301978050.

The spelling of 521718834 in words is "five hundred twenty-one million, seven hundred eighteen thousand, eight hundred thirty-four".