2751787981 has 2 divisors, whose sum is σ = 2751787982. Its totient is φ = 2751787980.

The previous prime is 2751787979. The next prime is 2751788009. The reversal of 2751787981 is 1897871572.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2186965225 + 564822756 = 46765^2 + 23766^2 .

It is a cyclic number.

It is not a de Polignac number, because 2751787981 - 2¹ = 2751787979 is a prime.

It is a super-2 number, since 2×2751787981² = 15144674184752112722, which contains 22 as substring.

Together with 2751787979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2751787921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1375893990 + 1375893991.

It is an arithmetic number, because the mean of its divisors is an integer number (1375893991).

Almost surely, 2^2751787981 is an apocalyptic number.

It is an amenable number.

2751787981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2751787981 is an equidigital number, since it uses as much as digits as its factorization.

2751787981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1975680, while the sum is 55.

The square root of 2751787981 is about 52457.4873683443. The cubic root of 2751787981 is about 1401.3232354905.

The spelling of 2751787981 in words is "two billion, seven hundred fifty-one million, seven hundred eighty-seven thousand, nine hundred eighty-one".