2981991889 has 2 divisors, whose sum is σ = 2981991890. Its totient is φ = 2981991888.

The previous prime is 2981991853. The next prime is 2981991899. The reversal of 2981991889 is 9881991892.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2023470289 + 958521600 = 44983^2 + 30960^2 .

It is a cyclic number.

It is not a de Polignac number, because 2981991889 - 2¹⁵ = 2981959121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2981991889.

It is not a weakly prime, because it can be changed into another prime (2981991839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1490995944 + 1490995945.

It is an arithmetic number, because the mean of its divisors is an integer number (1490995945).

Almost surely, 2^2981991889 is an apocalyptic number.

It is an amenable number.

2981991889 is a deficient number, since it is larger than the sum of its proper divisors (1).

2981991889 is an equidigital number, since it uses as much as digits as its factorization.

2981991889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6718464, while the sum is 64.

The square root of 2981991889 is about 54607.6174997591. The cubic root of 2981991889 is about 1439.3579778474.

The spelling of 2981991889 in words is "two billion, nine hundred eighty-one million, nine hundred ninety-one thousand, eight hundred eighty-nine".