255898381 has 2 divisors, whose sum is σ = 255898382. Its totient is φ = 255898380.

The previous prime is 255898373. The next prime is 255898421. The reversal of 255898381 is 183898552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180364900 + 75533481 = 13430^2 + 8691^2 .

It is a cyclic number.

It is not a de Polignac number, because 255898381 - 2³ = 255898373 is a prime.

It is a super-2 number, since 2×255898381² = 130967962796842322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255898351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127949190 + 127949191.

It is an arithmetic number, because the mean of its divisors is an integer number (127949191).

Almost surely, 2^255898381 is an apocalyptic number.

It is an amenable number.

255898381 is a deficient number, since it is larger than the sum of its proper divisors (1).

255898381 is an equidigital number, since it uses as much as digits as its factorization.

255898381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 691200, while the sum is 49.

The square root of 255898381 is about 15996.8240910501. The cubic root of 255898381 is about 634.8763939872.

The spelling of 255898381 in words is "two hundred fifty-five million, eight hundred ninety-eight thousand, three hundred eighty-one".