2761731981 has 12 divisors (see below), whose sum is σ = 4028666460. Its totient is φ = 1822924800.

The previous prime is 2761731979. The next prime is 2761731989. The reversal of 2761731981 is 1891371672.

2761731981 is a `hidden beast` number, since 27 + 617 + 3 + 1 + 9 + 8 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2692675881 + 69056100 = 51891^2 + 8310^2 .

It is not a de Polignac number, because 2761731981 - 2¹ = 2761731979 is a prime.

It is a super-2 number, since 2×2761731981² = 15254327069756368722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2761731989) 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 11 ways as a sum of consecutive naturals, for example, 1518196 + ... + 1520013.

It is an arithmetic number, because the mean of its divisors is an integer number (335722205).

Almost surely, 2^2761731981 is an apocalyptic number.

It is an amenable number.

2761731981 is a deficient number, since it is larger than the sum of its proper divisors (1266934479).

2761731981 is a wasteful number, since it uses less digits than its factorization.

2761731981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3038316 (or 3038313 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 2761731981 is about 52552.1834084941. The cubic root of 2761731981 is about 1403.0091704597.

The spelling of 2761731981 in words is "two billion, seven hundred sixty-one million, seven hundred thirty-one thousand, nine hundred eighty-one".