1982115787 has 2 divisors, whose sum is σ = 1982115788. Its totient is φ = 1982115786.

The previous prime is 1982115769. The next prime is 1982115847. The reversal of 1982115787 is 7875112891.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1982115787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1982115787.

It is not a weakly prime, because it can be changed into another prime (1982125787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991057893 + 991057894.

It is an arithmetic number, because the mean of its divisors is an integer number (991057894).

Almost surely, 2^1982115787 is an apocalyptic number.

1982115787 is a deficient number, since it is larger than the sum of its proper divisors (1).

1982115787 is an equidigital number, since it uses as much as digits as its factorization.

1982115787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 49.

The square root of 1982115787 is about 44520.9589631670. The cubic root of 1982115787 is about 1256.1543506724.

The spelling of 1982115787 in words is "one billion, nine hundred eighty-two million, one hundred fifteen thousand, seven hundred eighty-seven".