255284921 has 2 divisors, whose sum is σ = 255284922. Its totient is φ = 255284920.

The previous prime is 255284863. The next prime is 255284923. The reversal of 255284921 is 129482552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223801600 + 31483321 = 14960^2 + 5611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255284921 is a prime.

Together with 255284923, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_13952468 and since 255284921 and 13952468 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (255284923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127642460 + 127642461.

It is an arithmetic number, because the mean of its divisors is an integer number (127642461).

Almost surely, 2^255284921 is an apocalyptic number.

It is an amenable number.

255284921 is a deficient number, since it is larger than the sum of its proper divisors (1).

255284921 is an equidigital number, since it uses as much as digits as its factorization.

255284921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57600, while the sum is 38.

The square root of 255284921 is about 15977.6381546210. The cubic root of 255284921 is about 634.3686626107.

The spelling of 255284921 in words is "two hundred fifty-five million, two hundred eighty-four thousand, nine hundred twenty-one".