2756871981 has 12 divisors (see below), whose sum is σ = 4041584352. Its totient is φ = 1810482696.

The previous prime is 2756871947. The next prime is 2756872007. The reversal of 2756871981 is 1891786572.

2756871981 is a `hidden beast` number, since 2 + 7 + 568 + 71 + 9 + 8 + 1 = 666.

It is not a de Polignac number, because 2756871981 - 2⁷ = 2756871853 is a prime.

It is a super-2 number, since 2×2756871981² = 15200686239245728722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2756871911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2285361 + ... + 2286566.

It is an arithmetic number, because the mean of its divisors is an integer number (336798696).

Almost surely, 2^2756871981 is an apocalyptic number.

It is an amenable number.

2756871981 is a deficient number, since it is larger than the sum of its proper divisors (1284712371).

2756871981 is a wasteful number, since it uses less digits than its factorization.

2756871981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4572000 (or 4571997 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 54.

The square root of 2756871981 is about 52505.9232944246. The cubic root of 2756871981 is about 1402.1856982984.

The spelling of 2756871981 in words is "two billion, seven hundred fifty-six million, eight hundred seventy-one thousand, nine hundred eighty-one".