255689961 has 8 divisors (see below), whose sum is σ = 343178304. Its totient is φ = 169330800.

The previous prime is 255689939. The next prime is 255689971. The reversal of 255689961 is 169986552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 255689961 - 2⁹ = 255689449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (255689921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 281766 + ... + 282671.

It is an arithmetic number, because the mean of its divisors is an integer number (42897288).

Almost surely, 2^255689961 is an apocalyptic number.

It is an amenable number.

255689961 is a deficient number, since it is larger than the sum of its proper divisors (87488343).

255689961 is a wasteful number, since it uses less digits than its factorization.

255689961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564591.

The product of its digits is 1166400, while the sum is 51.

The square root of 255689961 is about 15990.3083459951. The cubic root of 255689961 is about 634.7039858652.

The spelling of 255689961 in words is "two hundred fifty-five million, six hundred eighty-nine thousand, nine hundred sixty-one".