521853849 has 24 divisors (see below), whose sum is σ = 825630624. Its totient is φ = 315000000.

The previous prime is 521853823. The next prime is 521853853. The reversal of 521853849 is 948358125.

521853849 is a `hidden beast` number, since 521 + 85 + 3 + 8 + 49 = 666.

It is not a de Polignac number, because 521853849 - 2²³ = 513465241 is a prime.

It is a super-2 number, since 2×521853849² = 544662879432229602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (521853749) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14349 + ... + 35349.

It is an arithmetic number, because the mean of its divisors is an integer number (34401276).

Almost surely, 2^521853849 is an apocalyptic number.

It is an amenable number.

521853849 is a deficient number, since it is larger than the sum of its proper divisors (303776775).

521853849 is a wasteful number, since it uses less digits than its factorization.

521853849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21269 (or 21266 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 521853849 is about 22844.1206659394. The cubic root of 521853849 is about 805.0996360863.

The spelling of 521853849 in words is "five hundred twenty-one million, eight hundred fifty-three thousand, eight hundred forty-nine".