2109981239 has 2 divisors, whose sum is σ = 2109981240. Its totient is φ = 2109981238.

The previous prime is 2109981191. The next prime is 2109981253. The reversal of 2109981239 is 9321899012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2109981239 - 2¹² = 2109977143 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2109981239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2109981439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1054990619 + 1054990620.

It is an arithmetic number, because the mean of its divisors is an integer number (1054990620).

Almost surely, 2^2109981239 is an apocalyptic number.

2109981239 is a deficient number, since it is larger than the sum of its proper divisors (1).

2109981239 is an equidigital number, since it uses as much as digits as its factorization.

2109981239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 2109981239 is about 45934.5320973230. The cubic root of 2109981239 is about 1282.6048109482.

The spelling of 2109981239 in words is "two billion, one hundred nine million, nine hundred eighty-one thousand, two hundred thirty-nine".