1139591 has 4 divisors (see below), whose sum is σ = 1176384. Its totient is φ = 1102800.

The previous prime is 1139587. The next prime is 1139623. The reversal of 1139591 is 1959311.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1139591 - 2² = 1139587 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1139521) 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, 18350 + ... + 18411.

It is an arithmetic number, because the mean of its divisors is an integer number (294096).

2^1139591 is an apocalyptic number.

1139591 is a deficient number, since it is larger than the sum of its proper divisors (36793).

1139591 is an equidigital number, since it uses as much as digits as its factorization.

1139591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36792.

The product of its digits is 1215, while the sum is 29.

The square root of 1139591 is about 1067.5162762225. The cubic root of 1139591 is about 104.4518982240.

The spelling of 1139591 in words is "one million, one hundred thirty-nine thousand, five hundred ninety-one".