1255941981 has 36 divisors (see below), whose sum is σ = 2114526492. Its totient is φ = 716252544.

The previous prime is 1255941977. The next prime is 1255942013. The reversal of 1255941981 is 1891495521.

1255941981 is a `hidden beast` number, since 1 + 2 + 559 + 4 + 1 + 98 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 49491225 + 1206450756 = 7035^2 + 34734^2 .

It is not a de Polignac number, because 1255941981 - 2² = 1255941977 is a prime.

It is a super-3 number, since 3×1255941981³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255941931) 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 35 ways as a sum of consecutive naturals, for example, 243081 + ... + 248193.

It is an arithmetic number, because the mean of its divisors is an integer number (58736847).

Almost surely, 2^1255941981 is an apocalyptic number.

It is an amenable number.

1255941981 is a deficient number, since it is larger than the sum of its proper divisors (858584511).

1255941981 is a wasteful number, since it uses less digits than its factorization.

1255941981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5690 (or 5680 counting only the distinct ones).

The product of its digits is 129600, while the sum is 45.

The square root of 1255941981 is about 35439.2717334880. The cubic root of 1255941981 is about 1078.9215288667.

The spelling of 1255941981 in words is "one billion, two hundred fifty-five million, nine hundred forty-one thousand, nine hundred eighty-one".