1981895299 has 2 divisors, whose sum is σ = 1981895300. Its totient is φ = 1981895298.

The previous prime is 1981895291. The next prime is 1981895341. The reversal of 1981895299 is 9925981891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1981895299 - 2³ = 1981895291 is a prime.

It is not a weakly prime, because it can be changed into another prime (1981895291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990947649 + 990947650.

It is an arithmetic number, because the mean of its divisors is an integer number (990947650).

Almost surely, 2^1981895299 is an apocalyptic number.

1981895299 is a deficient number, since it is larger than the sum of its proper divisors (1).

1981895299 is an equidigital number, since it uses as much as digits as its factorization.

1981895299 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4199040, while the sum is 61.

The square root of 1981895299 is about 44518.4826673147. The cubic root of 1981895299 is about 1256.1077712827.

The spelling of 1981895299 in words is "one billion, nine hundred eighty-one million, eight hundred ninety-five thousand, two hundred ninety-nine".