513255221 has 4 divisors (see below), whose sum is σ = 513876672. Its totient is φ = 512633772.

The previous prime is 513255203. The next prime is 513255269. The reversal of 513255221 is 122552315.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122552315 = 5 ⋅24510463.

It is a cyclic number.

It is not a de Polignac number, because 513255221 - 2¹⁸ = 512993077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513257221) 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, 309485 + ... + 311138.

It is an arithmetic number, because the mean of its divisors is an integer number (128469168).

Almost surely, 2^513255221 is an apocalyptic number.

It is an amenable number.

513255221 is a deficient number, since it is larger than the sum of its proper divisors (621451).

513255221 is an equidigital number, since it uses as much as digits as its factorization.

513255221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621450.

The product of its digits is 3000, while the sum is 26.

The square root of 513255221 is about 22655.1367464423. The cubic root of 513255221 is about 800.6532274098.

The spelling of 513255221 in words is "five hundred thirteen million, two hundred fifty-five thousand, two hundred twenty-one".