521863361 has 4 divisors (see below), whose sum is σ = 522082224. Its totient is φ = 521644500.

The previous prime is 521863343. The next prime is 521863369. The reversal of 521863361 is 163368125.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 521863361 - 2¹⁸ = 521601217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521863369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105815 + ... + 110636.

It is an arithmetic number, because the mean of its divisors is an integer number (130520556).

Almost surely, 2^521863361 is an apocalyptic number.

It is an amenable number.

521863361 is a deficient number, since it is larger than the sum of its proper divisors (218863).

521863361 is a wasteful number, since it uses less digits than its factorization.

521863361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218862.

The product of its digits is 25920, while the sum is 35.

The square root of 521863361 is about 22844.3288586030. The cubic root of 521863361 is about 805.1045276610.

The spelling of 521863361 in words is "five hundred twenty-one million, eight hundred sixty-three thousand, three hundred sixty-one".