255607861 has 4 divisors (see below), whose sum is σ = 257323500. Its totient is φ = 253892224.

The previous prime is 255607853. The next prime is 255607939. The reversal of 255607861 is 168706552.

255607861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 130302225 + 125305636 = 11415^2 + 11194^2 .

It is a cyclic number.

It is not a de Polignac number, because 255607861 - 2³ = 255607853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255607811) 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, 857596 + ... + 857893.

It is an arithmetic number, because the mean of its divisors is an integer number (64330875).

Almost surely, 2^255607861 is an apocalyptic number.

It is an amenable number.

255607861 is a deficient number, since it is larger than the sum of its proper divisors (1715639).

255607861 is a wasteful number, since it uses less digits than its factorization.

255607861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1715638.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 255607861 is about 15987.7409598730. The cubic root of 255607861 is about 634.6360458031.

The spelling of 255607861 in words is "two hundred fifty-five million, six hundred seven thousand, eight hundred sixty-one".