255636869 has 2 divisors, whose sum is σ = 255636870. Its totient is φ = 255636868.

The previous prime is 255636863. The next prime is 255636893. The reversal of 255636869 is 968636552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145491844 + 110145025 = 12062^2 + 10495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255636869 is a prime.

It is a super-2 number, since 2×255636869² = 130700417584246322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255636863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127818434 + 127818435.

It is an arithmetic number, because the mean of its divisors is an integer number (127818435).

Almost surely, 2^255636869 is an apocalyptic number.

It is an amenable number.

255636869 is a deficient number, since it is larger than the sum of its proper divisors (1).

255636869 is an equidigital number, since it uses as much as digits as its factorization.

255636869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 50.

The square root of 255636869 is about 15988.6481292197. The cubic root of 255636869 is about 634.6600524018.

The spelling of 255636869 in words is "two hundred fifty-five million, six hundred thirty-six thousand, eight hundred sixty-nine".