255235981 has 32 divisors (see below), whose sum is σ = 346042368. Its totient is φ = 181794240.

The previous prime is 255235979. The next prime is 255235993. The reversal of 255235981 is 189532552.

It is a cyclic number.

It is not a de Polignac number, because 255235981 - 2¹ = 255235979 is a prime.

It is a super-2 number, since 2×255235981² = 130290811994064722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255235901) 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 31 ways as a sum of consecutive naturals, for example, 105916 + ... + 108298.

It is an arithmetic number, because the mean of its divisors is an integer number (10813824).

Almost surely, 2^255235981 is an apocalyptic number.

It is an amenable number.

255235981 is a deficient number, since it is larger than the sum of its proper divisors (90806387).

255235981 is a wasteful number, since it uses less digits than its factorization.

255235981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2521.

The product of its digits is 108000, while the sum is 40.

The square root of 255235981 is about 15976.1065657437. The cubic root of 255235981 is about 634.3281223047.

The spelling of 255235981 in words is "two hundred fifty-five million, two hundred thirty-five thousand, nine hundred eighty-one".