1981982767 has 2 divisors, whose sum is σ = 1981982768. Its totient is φ = 1981982766.

The previous prime is 1981982747. The next prime is 1981982771. The reversal of 1981982767 is 7672891891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1981982767 is a prime.

It is a congruent number.

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, 990991383 + 990991384.

It is an arithmetic number, because the mean of its divisors is an integer number (990991384).

Almost surely, 2^1981982767 is an apocalyptic number.

1981982767 is a deficient number, since it is larger than the sum of its proper divisors (1).

1981982767 is an equidigital number, since it uses as much as digits as its factorization.

1981982767 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3048192, while the sum is 58.

The square root of 1981982767 is about 44519.4650349709. The cubic root of 1981982767 is about 1256.1262498267.

The spelling of 1981982767 in words is "one billion, nine hundred eighty-one million, nine hundred eighty-two thousand, seven hundred sixty-seven".