255131381 has 2 divisors, whose sum is σ = 255131382. Its totient is φ = 255131380.

The previous prime is 255131323. The next prime is 255131413. The reversal of 255131381 is 183131552.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134351281 + 120780100 = 11591^2 + 10990^2 .

It is a cyclic number.

It is not a de Polignac number, because 255131381 - 2²² = 250937077 is a prime.

It is a super-2 number, since 2×255131381² = 130184043141934322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255131311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127565690 + 127565691.

It is an arithmetic number, because the mean of its divisors is an integer number (127565691).

Almost surely, 2^255131381 is an apocalyptic number.

It is an amenable number.

255131381 is a deficient number, since it is larger than the sum of its proper divisors (1).

255131381 is an equidigital number, since it uses as much as digits as its factorization.

255131381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 29.

The square root of 255131381 is about 15972.8325916226. The cubic root of 255131381 is about 634.2414576851.

The spelling of 255131381 in words is "two hundred fifty-five million, one hundred thirty-one thousand, three hundred eighty-one".