521320259 has 4 divisors (see below), whose sum is σ = 527177880. Its totient is φ = 515462640.

The previous prime is 521320253. The next prime is 521320301. The reversal of 521320259 is 952023125.

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 521320259 - 2¹² = 521316163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521320253) 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, 2928677 + ... + 2928854.

It is an arithmetic number, because the mean of its divisors is an integer number (131794470).

Almost surely, 2^521320259 is an apocalyptic number.

521320259 is a deficient number, since it is larger than the sum of its proper divisors (5857621).

521320259 is an equidigital number, since it uses as much as digits as its factorization.

521320259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5857620.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 521320259 is about 22832.4387440326. The cubic root of 521320259 is about 804.8251405757.

The spelling of 521320259 in words is "five hundred twenty-one million, three hundred twenty thousand, two hundred fifty-nine".