521271099 has 16 divisors (see below), whose sum is σ = 812899200. Its totient is φ = 329223528.

The previous prime is 521271083. The next prime is 521271161. The reversal of 521271099 is 990172125.

521271099 is a `hidden beast` number, since 521 + 27 + 109 + 9 = 666.

It is not a de Polignac number, because 521271099 - 2⁴ = 521271083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (521271299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 507549 + ... + 508574.

It is an arithmetic number, because the mean of its divisors is an integer number (50806200).

Almost surely, 2^521271099 is an apocalyptic number.

521271099 is a deficient number, since it is larger than the sum of its proper divisors (291628101).

521271099 is a wasteful number, since it uses less digits than its factorization.

521271099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016151 (or 1016145 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The square root of 521271099 is about 22831.3621801241. The cubic root of 521271099 is about 804.7998417011.

The spelling of 521271099 in words is "five hundred twenty-one million, two hundred seventy-one thousand, ninety-nine".