1138982891 has 2 divisors, whose sum is σ = 1138982892. Its totient is φ = 1138982890.

The previous prime is 1138982869. The next prime is 1138982893. The reversal of 1138982891 is 1982898311.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1138982891 - 2¹⁰ = 1138981867 is a prime.

Together with 1138982893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1138982893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569491445 + 569491446.

It is an arithmetic number, because the mean of its divisors is an integer number (569491446).

Almost surely, 2^1138982891 is an apocalyptic number.

1138982891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1138982891 is an equidigital number, since it uses as much as digits as its factorization.

1138982891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 50.

The square root of 1138982891 is about 33748.8205867998. The cubic root of 1138982891 is about 1044.3331569717. Note that the first 3 decimals are identical.

The spelling of 1138982891 in words is "one billion, one hundred thirty-eight million, nine hundred eighty-two thousand, eight hundred ninety-one".