2138863081 has 8 divisors (see below), whose sum is σ = 2243191104. Its totient is φ = 2035479600.

The previous prime is 2138863057. The next prime is 2138863093. The reversal of 2138863081 is 1803688312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2138863081 - 2⁷ = 2138862953 is a prime.

It is a super-2 number, since 2×2138863081² = 9149470558529625122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2138863681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231495 + ... + 240556.

It is an arithmetic number, because the mean of its divisors is an integer number (280398888).

Almost surely, 2^2138863081 is an apocalyptic number.

It is an amenable number.

2138863081 is a deficient number, since it is larger than the sum of its proper divisors (104328023).

2138863081 is a wasteful number, since it uses less digits than its factorization.

2138863081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472271.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 2138863081 is about 46247.8440686698. The cubic root of 2138863081 is about 1288.4304932990.

The spelling of 2138863081 in words is "two billion, one hundred thirty-eight million, eight hundred sixty-three thousand, eighty-one".