255690609 has 16 divisors (see below), whose sum is σ = 365361792. Its totient is φ = 158640768.

The previous prime is 255690587. The next prime is 255690623. The reversal of 255690609 is 906096552.

It is not a de Polignac number, because 255690609 - 2⁵ = 255690577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (255690509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47524 + ... + 52629.

It is an arithmetic number, because the mean of its divisors is an integer number (22835112).

Almost surely, 2^255690609 is an apocalyptic number.

It is an amenable number.

255690609 is a deficient number, since it is larger than the sum of its proper divisors (109671183).

255690609 is a wasteful number, since it uses less digits than its factorization.

255690609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100216.

The product of its (nonzero) digits is 145800, while the sum is 42.

The square root of 255690609 is about 15990.3286082557. The cubic root of 255690609 is about 634.7045220456.

The spelling of 255690609 in words is "two hundred fifty-five million, six hundred ninety thousand, six hundred nine".