521902 has 4 divisors (see below), whose sum is σ = 782856. Its totient is φ = 260950.

The previous prime is 521897. The next prime is 521903. The reversal of 521902 is 209125.

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

It is a self number, because there is not a number n which added to its sum of digits gives 521902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130474 + ... + 130477.

It is an arithmetic number, because the mean of its divisors is an integer number (195714).

2⁵²¹⁹⁰² is an apocalyptic number.

521902 is a deficient number, since it is larger than the sum of its proper divisors (260954).

521902 is a wasteful number, since it uses less digits than its factorization.

521902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260953.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 521902 is about 722.4278510689. The cubic root of 521902 is about 80.5124397272.

The spelling of 521902 in words is "five hundred twenty-one thousand, nine hundred two".