255440069 has 2 divisors, whose sum is σ = 255440070. Its totient is φ = 255440068.

The previous prime is 255440041. The next prime is 255440077. The reversal of 255440069 is 960044552.

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., 239940100 + 15499969 = 15490^2 + 3937^2 .

It is a cyclic number.

It is not a de Polignac number, because 255440069 - 2⁸ = 255439813 is a prime.

It is a super-2 number, since 2×255440069² = 130499257701449522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255440089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127720034 + 127720035.

It is an arithmetic number, because the mean of its divisors is an integer number (127720035).

Almost surely, 2^255440069 is an apocalyptic number.

It is an amenable number.

255440069 is a deficient number, since it is larger than the sum of its proper divisors (1).

255440069 is an equidigital number, since it uses as much as digits as its factorization.

255440069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 255440069 is about 15982.4925778178. The cubic root of 255440069 is about 634.4971479352.

The spelling of 255440069 in words is "two hundred fifty-five million, four hundred forty thousand, sixty-nine".