521970516 has 36 divisors (see below), whose sum is σ = 1397040372. Its totient is φ = 163755264.

The previous prime is 521970511. The next prime is 521970517. The reversal of 521970516 is 615079125.

521970516 is a `hidden beast` number, since 52 + 1 + 97 + 0 + 516 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 475676100 + 46294416 = 21810^2 + 6804^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521970511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 425835 + ... + 427058.

It is an arithmetic number, because the mean of its divisors is an integer number (38806677).

Almost surely, 2^521970516 is an apocalyptic number.

It is an amenable number.

521970516 is an abundant number, since it is smaller than the sum of its proper divisors (875069856).

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

521970516 is a wasteful number, since it uses less digits than its factorization.

521970516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852920 (or 852915 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 36.

The square root of 521970516 is about 22846.6740686692. The cubic root of 521970516 is about 805.1596283368.

The spelling of 521970516 in words is "five hundred twenty-one million, nine hundred seventy thousand, five hundred sixteen".