521974 has 4 divisors (see below), whose sum is σ = 782964. Its totient is φ = 260986.

The previous prime is 521929. The next prime is 521981. The reversal of 521974 is 479125.

It is a happy number.

521974 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

521974 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130492 + ... + 130495.

It is an arithmetic number, because the mean of its divisors is an integer number (195741).

2⁵²¹⁹⁷⁴ is an apocalyptic number.

521974 is a deficient number, since it is larger than the sum of its proper divisors (260990).

521974 is a wasteful number, since it uses less digits than its factorization.

521974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260989.

The product of its digits is 2520, while the sum is 28.

The square root of 521974 is about 722.4776813162. The cubic root of 521974 is about 80.5161419734.

Subtracting from 521974 its reverse (479125), we obtain a square (42849 = 207²).

The spelling of 521974 in words is "five hundred twenty-one thousand, nine hundred seventy-four".