521849 has 4 divisors (see below), whose sum is σ = 552564. Its totient is φ = 491136.

The previous prime is 521831. The next prime is 521861. The reversal of 521849 is 948125.

521849 = 107² + 108² + ... + 140².

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

It can be written as a sum of positive squares in 2 ways, for example, as 211600 + 310249 = 460^2 + 557^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521849 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 521849.

It is not an unprimeable number, because it can be changed into a prime (521809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15332 + ... + 15365.

It is an arithmetic number, because the mean of its divisors is an integer number (138141).

2⁵²¹⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

521849 is a deficient number, since it is larger than the sum of its proper divisors (30715).

521849 is a wasteful number, since it uses less digits than its factorization.

521849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30714.

The product of its digits is 2880, while the sum is 29.

The square root of 521849 is about 722.3911682738. The cubic root of 521849 is about 80.5097142451.

The spelling of 521849 in words is "five hundred twenty-one thousand, eight hundred forty-nine".