1981982747 has 2 divisors, whose sum is σ = 1981982748. Its totient is φ = 1981982746.

The previous prime is 1981982707. The next prime is 1981982767. The reversal of 1981982747 is 7472891891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1981982747 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1981982692 and 1981982701.

It is not a weakly prime, because it can be changed into another prime (1981982707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990991373 + 990991374.

It is an arithmetic number, because the mean of its divisors is an integer number (990991374).

Almost surely, 2^1981982747 is an apocalyptic number.

1981982747 is a deficient number, since it is larger than the sum of its proper divisors (1).

1981982747 is an equidigital number, since it uses as much as digits as its factorization.

1981982747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2032128, while the sum is 56.

The square root of 1981982747 is about 44519.4648103501. The cubic root of 1981982747 is about 1256.1262456015.

The spelling of 1981982747 in words is "one billion, nine hundred eighty-one million, nine hundred eighty-two thousand, seven hundred forty-seven".