521299 has 2 divisors, whose sum is σ = 521300. Its totient is φ = 521298.

The previous prime is 521281. The next prime is 521309. The reversal of 521299 is 992125.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 521299 - 2⁵ = 521267 is a prime.

521299 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (521399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260649 + 260650.

It is an arithmetic number, because the mean of its divisors is an integer number (260650).

2⁵²¹²⁹⁹ is an apocalyptic number.

521299 is a deficient number, since it is larger than the sum of its proper divisors (1).

521299 is an equidigital number, since it uses as much as digits as its factorization.

521299 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620, while the sum is 28.

The square root of 521299 is about 722.0103877369. The cubic root of 521299 is about 80.4814200397.

It can be divided in two parts, 521 and 299, that added together give a triangular number (820 = T₄₀).

The spelling of 521299 in words is "five hundred twenty-one thousand, two hundred ninety-nine".