2138771641 has 4 divisors (see below), whose sum is σ = 2142682192. Its totient is φ = 2134861092.

The previous prime is 2138771617. The next prime is 2138771659. The reversal of 2138771641 is 1461778312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2138771641 - 2¹¹ = 2138769593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2138771594 and 2138771603.

It is not an unprimeable number, because it can be changed into a prime (2138771671) 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 in 3 ways as a sum of consecutive naturals, for example, 1954455 + ... + 1955548.

It is an arithmetic number, because the mean of its divisors is an integer number (535670548).

Almost surely, 2^2138771641 is an apocalyptic number.

It is an amenable number.

2138771641 is a deficient number, since it is larger than the sum of its proper divisors (3910551).

2138771641 is an equidigital number, since it uses as much as digits as its factorization.

2138771641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3910550.

The product of its digits is 56448, while the sum is 40.

The square root of 2138771641 is about 46246.8554714804. The cubic root of 2138771641 is about 1288.4121321793.

The spelling of 2138771641 in words is "two billion, one hundred thirty-eight million, seven hundred seventy-one thousand, six hundred forty-one".