2138079881 has 4 divisors (see below), whose sum is σ = 2443519872. Its totient is φ = 1832639892.

The previous prime is 2138079877. The next prime is 2138079887. The reversal of 2138079881 is 1889708312.

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 2138079881 - 2² = 2138079877 is a prime.

It is a super-2 number, since 2×2138079881² = 9142771155073948322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2138079887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152719985 + ... + 152719998.

It is an arithmetic number, because the mean of its divisors is an integer number (610879968).

Almost surely, 2^2138079881 is an apocalyptic number.

It is an amenable number.

2138079881 is a deficient number, since it is larger than the sum of its proper divisors (305439991).

2138079881 is an equidigital number, since it uses as much as digits as its factorization.

2138079881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305439990.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 2138079881 is about 46239.3758716529. The cubic root of 2138079881 is about 1288.2732100574.

The spelling of 2138079881 in words is "two billion, one hundred thirty-eight million, seventy-nine thousand, eight hundred eighty-one".