521231016 has 96 divisors (see below), whose sum is σ = 1407335040. Its totient is φ = 160313856.

The previous prime is 521230981. The next prime is 521231017. The reversal of 521231016 is 610132125.

It is a junction number, because it is equal to n+sod(n) for n = 521230983 and 521231001.

It is not an unprimeable number, because it can be changed into a prime (521231017) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1420065 + ... + 1420431.

It is an arithmetic number, because the mean of its divisors is an integer number (14659740).

Almost surely, 2^521231016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521231016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (703667520).

521231016 is an abundant number, since it is smaller than the sum of its proper divisors (886104024).

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

521231016 is a wasteful number, since it uses less digits than its factorization.

521231016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511 (or 448 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 521231016 is about 22830.4843575427. The cubic root of 521231016 is about 804.7792128837.

The spelling of 521231016 in words is "five hundred twenty-one million, two hundred thirty-one thousand, sixteen".