521444002 has 4 divisors (see below), whose sum is σ = 782166006. Its totient is φ = 260722000.

The previous prime is 521443987. The next prime is 521444039. The reversal of 521444002 is 200444125.

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., 405257161 + 116186841 = 20131^2 + 10779^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130360999 + ... + 130361002.

Almost surely, 2^521444002 is an apocalyptic number.

521444002 is a deficient number, since it is larger than the sum of its proper divisors (260722004).

521444002 is a wasteful number, since it uses less digits than its factorization.

521444002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260722003.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 521444002 is about 22835.1483901463. The cubic root of 521444002 is about 804.8888145502. Note that the first 4 decimals are identical.

Adding to 521444002 its reverse (200444125), we get a palindrome (721888127).

The spelling of 521444002 in words is "five hundred twenty-one million, four hundred forty-four thousand, two".