255697609 has 4 divisors (see below), whose sum is σ = 257711104. Its totient is φ = 253684116.

The previous prime is 255697591. The next prime is 255697613. The reversal of 255697609 is 906796552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 255697609 - 2⁵ = 255697577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255697619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1006557 + ... + 1006810.

It is an arithmetic number, because the mean of its divisors is an integer number (64427776).

Almost surely, 2^255697609 is an apocalyptic number.

It is an amenable number.

255697609 is a deficient number, since it is larger than the sum of its proper divisors (2013495).

255697609 is a wasteful number, since it uses less digits than its factorization.

255697609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2013494.

The product of its (nonzero) digits is 1020600, while the sum is 49.

The square root of 255697609 is about 15990.5474890637. The cubic root of 255697609 is about 634.7103140601.

The spelling of 255697609 in words is "two hundred fifty-five million, six hundred ninety-seven thousand, six hundred nine".