255238909 has 2 divisors, whose sum is σ = 255238910. Its totient is φ = 255238908.

The previous prime is 255238883. The next prime is 255238933. The reversal of 255238909 is 909832552.

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., 253605625 + 1633284 = 15925^2 + 1278^2 .

It is a cyclic number.

It is not a de Polignac number, because 255238909 - 2¹⁵ = 255206141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255238939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127619454 + 127619455.

It is an arithmetic number, because the mean of its divisors is an integer number (127619455).

Almost surely, 2^255238909 is an apocalyptic number.

It is an amenable number.

255238909 is a deficient number, since it is larger than the sum of its proper divisors (1).

255238909 is an equidigital number, since it uses as much as digits as its factorization.

255238909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 255238909 is about 15976.1982023259. The cubic root of 255238909 is about 634.3305479105.

The spelling of 255238909 in words is "two hundred fifty-five million, two hundred thirty-eight thousand, nine hundred nine".