1138591 has 2 divisors, whose sum is σ = 1138592. Its totient is φ = 1138590.

The previous prime is 1138589. The next prime is 1138637. The reversal of 1138591 is 1958311.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1138591 - 2¹ = 1138589 is a prime.

Together with 1138589, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1138091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569295 + 569296.

It is an arithmetic number, because the mean of its divisors is an integer number (569296).

2^1138591 is an apocalyptic number.

1138591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1138591 is an equidigital number, since it uses as much as digits as its factorization.

1138591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 28.

The square root of 1138591 is about 1067.0477964927. The cubic root of 1138591 is about 104.4213368309.

It can be divided in two parts, 11385 and 91, that added together give a triangular number (11476 = T₁₅₁).

The spelling of 1138591 in words is "one million, one hundred thirty-eight thousand, five hundred ninety-one".