2138776841 has 2 divisors, whose sum is σ = 2138776842. Its totient is φ = 2138776840.

The previous prime is 2138776799. The next prime is 2138776879. The reversal of 2138776841 is 1486778312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1707342400 + 431434441 = 41320^2 + 20771^2 .

It is a cyclic number.

It is not a de Polignac number, because 2138776841 - 2¹⁰ = 2138775817 is a prime.

It is not a weakly prime, because it can be changed into another prime (2138776891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069388420 + 1069388421.

It is an arithmetic number, because the mean of its divisors is an integer number (1069388421).

Almost surely, 2^2138776841 is an apocalyptic number.

It is an amenable number.

2138776841 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138776841 is an equidigital number, since it uses as much as digits as its factorization.

2138776841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584, while the sum is 47.

The square root of 2138776841 is about 46246.9116914849. The cubic root of 2138776841 is about 1288.4131763515.

The spelling of 2138776841 in words is "two billion, one hundred thirty-eight million, seven hundred seventy-six thousand, eight hundred forty-one".