1138621139 has 4 divisors (see below), whose sum is σ = 1139914440. Its totient is φ = 1137327840.

The previous prime is 1138621093. The next prime is 1138621157. The reversal of 1138621139 is 9311268311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9311268311 = 1129 ⋅8247359.

It is a cyclic number.

It is not a de Polignac number, because 1138621139 - 2²⁰ = 1137572563 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1138621099 and 1138621108.

It is not an unprimeable number, because it can be changed into a prime (1138621039) 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, 645329 + ... + 647090.

It is an arithmetic number, because the mean of its divisors is an integer number (284978610).

Almost surely, 2^1138621139 is an apocalyptic number.

1138621139 is a deficient number, since it is larger than the sum of its proper divisors (1293301).

1138621139 is an equidigital number, since it uses as much as digits as its factorization.

1138621139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293300.

The product of its digits is 7776, while the sum is 35.

The square root of 1138621139 is about 33743.4606849979. The cubic root of 1138621139 is about 1044.2225818217. Note that the first 3 decimals are identical.

The spelling of 1138621139 in words is "one billion, one hundred thirty-eight million, six hundred twenty-one thousand, one hundred thirty-nine".