2138671871 has 4 divisors (see below), whose sum is σ = 2444196432. Its totient is φ = 1833147312.

The previous prime is 2138671867. The next prime is 2138671877. The reversal of 2138671871 is 1781768312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2138671871 - 2² = 2138671867 is a prime.

It is a super-3 number, since 3×2138671871³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138671877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152762270 + ... + 152762283.

It is an arithmetic number, because the mean of its divisors is an integer number (611049108).

Almost surely, 2^2138671871 is an apocalyptic number.

2138671871 is a deficient number, since it is larger than the sum of its proper divisors (305524561).

2138671871 is an equidigital number, since it uses as much as digits as its factorization.

2138671871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305524560.

The product of its digits is 112896, while the sum is 44.

The square root of 2138671871 is about 46245.7767909676. The cubic root of 2138671871 is about 1288.3920978015.

The spelling of 2138671871 in words is "two billion, one hundred thirty-eight million, six hundred seventy-one thousand, eight hundred seventy-one".