521099 has 4 divisors (see below), whose sum is σ = 524160. Its totient is φ = 518040.

The previous prime is 521063. The next prime is 521107. The reversal of 521099 is 990125.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 521099 - 2¹² = 517003 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 521099.

It is not an unprimeable number, because it can be changed into a prime (521009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1259 + ... + 1620.

It is an arithmetic number, because the mean of its divisors is an integer number (131040).

2⁵²¹⁰⁹⁹ is an apocalyptic number.

521099 is a deficient number, since it is larger than the sum of its proper divisors (3061).

521099 is a wasteful number, since it uses less digits than its factorization.

521099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3060.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 521099 is about 721.8718722876. The cubic root of 521099 is about 80.4711263037.

Adding to 521099 its sum of digits (26), we get a palindrome (521125).

The spelling of 521099 in words is "five hundred twenty-one thousand, ninety-nine".