521945 has 8 divisors (see below), whose sum is σ = 631680. Its totient is φ = 414000.

The previous prime is 521929. The next prime is 521981. The reversal of 521945 is 549125.

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

It is not a de Polignac number, because 521945 - 2⁴ = 521929 is a prime.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320 + ... + 1070.

It is an arithmetic number, because the mean of its divisors is an integer number (78960).

2⁵²¹⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

521945 is a deficient number, since it is larger than the sum of its proper divisors (109735).

521945 is a wasteful number, since it uses less digits than its factorization.

521945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895.

The product of its digits is 1800, while the sum is 26.

The square root of 521945 is about 722.4576112133. The cubic root of 521945 is about 80.5146508319.

The spelling of 521945 in words is "five hundred twenty-one thousand, nine hundred forty-five".