2138678371 has 2 divisors, whose sum is σ = 2138678372. Its totient is φ = 2138678370.

The previous prime is 2138678369. The next prime is 2138678413. The reversal of 2138678371 is 1738768312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2138678371 - 2¹ = 2138678369 is a prime.

Together with 2138678369, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2138678471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069339185 + 1069339186.

It is an arithmetic number, because the mean of its divisors is an integer number (1069339186).

Almost surely, 2^2138678371 is an apocalyptic number.

2138678371 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138678371 is an equidigital number, since it uses as much as digits as its factorization.

2138678371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 46.

The square root of 2138678371 is about 46245.8470676016. The cubic root of 2138678371 is about 1288.3934030571.

The spelling of 2138678371 in words is "two billion, one hundred thirty-eight million, six hundred seventy-eight thousand, three hundred seventy-one".