1138008491 has 2 divisors, whose sum is σ = 1138008492. Its totient is φ = 1138008490.

The previous prime is 1138008479. The next prime is 1138008493. The reversal of 1138008491 is 1948008311.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1138008491 - 2⁶ = 1138008427 is a prime.

Together with 1138008493, 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 (1138008493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569004245 + 569004246.

It is an arithmetic number, because the mean of its divisors is an integer number (569004246).

Almost surely, 2^1138008491 is an apocalyptic number.

1138008491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1138008491 is an equidigital number, since it uses as much as digits as its factorization.

1138008491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 1138008491 is about 33734.3814379336. The cubic root of 1138008491 is about 1044.0352629590.

The spelling of 1138008491 in words is "one billion, one hundred thirty-eight million, eight thousand, four hundred ninety-one".