255817442 has 4 divisors (see below), whose sum is σ = 383726166. Its totient is φ = 127908720.

The previous prime is 255817399. The next prime is 255817459. The reversal of 255817442 is 244718552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 210511081 + 45306361 = 14509^2 + 6731^2 .

It is a junction number, because it is equal to n+sod(n) for n = 255817396 and 255817405.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63954359 + ... + 63954362.

Almost surely, 2^255817442 is an apocalyptic number.

255817442 is a deficient number, since it is larger than the sum of its proper divisors (127908724).

255817442 is a wasteful number, since it uses less digits than its factorization.

255817442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127908723.

The product of its digits is 89600, while the sum is 38.

The square root of 255817442 is about 15994.2940450649. The cubic root of 255817442 is about 634.8094511654.

The spelling of 255817442 in words is "two hundred fifty-five million, eight hundred seventeen thousand, four hundred forty-two".