2138280979 has 2 divisors, whose sum is σ = 2138280980. Its totient is φ = 2138280978.

The previous prime is 2138280959. The next prime is 2138281001. The reversal of 2138280979 is 9790828312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2138280979 is a prime.

It is not a weakly prime, because it can be changed into another prime (2138280959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069140489 + 1069140490.

It is an arithmetic number, because the mean of its divisors is an integer number (1069140490).

Almost surely, 2^2138280979 is an apocalyptic number.

2138280979 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138280979 is an equidigital number, since it uses as much as digits as its factorization.

2138280979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 2138280979 is about 46241.5503524698. The cubic root of 2138280979 is about 1288.3135984835.

The spelling of 2138280979 in words is "two billion, one hundred thirty-eight million, two hundred eighty thousand, nine hundred seventy-nine".