255821371 has 4 divisors (see below), whose sum is σ = 275499952. Its totient is φ = 236142792.

The previous prime is 255821359. The next prime is 255821381. The reversal of 255821371 is 173128552.

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 255821371 - 2⁷ = 255821243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (255821351) 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, 9839271 + ... + 9839296.

It is an arithmetic number, because the mean of its divisors is an integer number (68874988).

Almost surely, 2^255821371 is an apocalyptic number.

255821371 is a deficient number, since it is larger than the sum of its proper divisors (19678581).

255821371 is a wasteful number, since it uses less digits than its factorization.

255821371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19678580.

The product of its digits is 16800, while the sum is 34.

The square root of 255821371 is about 15994.4168696455. The cubic root of 255821371 is about 634.8127010788.

The spelling of 255821371 in words is "two hundred fifty-five million, eight hundred twenty-one thousand, three hundred seventy-one".