255221399 has 4 divisors (see below), whose sum is σ = 255284136. Its totient is φ = 255158664.

The previous prime is 255221387. The next prime is 255221413. The reversal of 255221399 is 993122552.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255221399 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 (255221339) 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, 24809 + ... + 33554.

It is an arithmetic number, because the mean of its divisors is an integer number (63821034).

Almost surely, 2^255221399 is an apocalyptic number.

255221399 is a deficient number, since it is larger than the sum of its proper divisors (62737).

255221399 is an equidigital number, since it uses as much as digits as its factorization.

255221399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62736.

The product of its digits is 48600, while the sum is 38.

The square root of 255221399 is about 15975.6501902114. The cubic root of 255221399 is about 634.3160420475.

The spelling of 255221399 in words is "two hundred fifty-five million, two hundred twenty-one thousand, three hundred ninety-nine".