521382874 has 4 divisors (see below), whose sum is σ = 782074314. Its totient is φ = 260691436.

The previous prime is 521382871. The next prime is 521382881. The reversal of 521382874 is 478283125.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 313821225 + 207561649 = 17715^2 + 14407^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (521382871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130345717 + ... + 130345720.

Almost surely, 2^521382874 is an apocalyptic number.

521382874 is a deficient number, since it is larger than the sum of its proper divisors (260691440).

521382874 is a wasteful number, since it uses less digits than its factorization.

521382874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260691439.

The product of its digits is 107520, while the sum is 40.

The square root of 521382874 is about 22833.8098879710. The cubic root of 521382874 is about 804.8573614021.

The spelling of 521382874 in words is "five hundred twenty-one million, three hundred eighty-two thousand, eight hundred seventy-four".