521632873 has 8 divisors (see below), whose sum is σ = 537132456. Its totient is φ = 506265600.

The previous prime is 521632861. The next prime is 521632883. The reversal of 521632873 is 378236125.

It can be written as a sum of positive squares in 4 ways, for example, as 48483369 + 473149504 = 6963^2 + 21752^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 521632873 - 2⁵ = 521632841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521632823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25048 + ... + 40873.

It is an arithmetic number, because the mean of its divisors is an integer number (67141557).

Almost surely, 2^521632873 is an apocalyptic number.

It is an amenable number.

521632873 is a deficient number, since it is larger than the sum of its proper divisors (15499583).

521632873 is a wasteful number, since it uses less digits than its factorization.

521632873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66155.

The product of its digits is 60480, while the sum is 37.

The square root of 521632873 is about 22839.2835483077. The cubic root of 521632873 is about 804.9859817782.

Adding to 521632873 its reverse (378236125), we get a palindrome (899868998).

The spelling of 521632873 in words is "five hundred twenty-one million, six hundred thirty-two thousand, eight hundred seventy-three".