255446981 has 8 divisors (see below), whose sum is σ = 271658520. Its totient is φ = 239367168.

The previous prime is 255446977. The next prime is 255447013. The reversal of 255446981 is 189644552.

It can be written as a sum of positive squares in 4 ways, for example, as 214358881 + 41088100 = 14641^2 + 6410^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 255446981 - 2² = 255446977 is a prime.

It is a super-2 number, since 2×255446981² = 130506320204028722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255446921) 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, 28916 + ... + 36701.

It is an arithmetic number, because the mean of its divisors is an integer number (33957315).

Almost surely, 2^255446981 is an apocalyptic number.

It is an amenable number.

255446981 is a deficient number, since it is larger than the sum of its proper divisors (16211539).

255446981 is a wasteful number, since it uses less digits than its factorization.

255446981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65863.

The product of its digits is 345600, while the sum is 44.

The square root of 255446981 is about 15982.7088129641. The cubic root of 255446981 is about 634.5028708754.

The spelling of 255446981 in words is "two hundred fifty-five million, four hundred forty-six thousand, nine hundred eighty-one".