1191039 has 4 divisors (see below), whose sum is σ = 1588056. Its totient is φ = 794024.

The previous prime is 1191031. The next prime is 1191061. The reversal of 1191039 is 9301911.

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 1191039 - 2³ = 1191031 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191031) 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, 198504 + ... + 198509.

It is an arithmetic number, because the mean of its divisors is an integer number (397014).

2^1191039 is an apocalyptic number.

1191039 is a deficient number, since it is larger than the sum of its proper divisors (397017).

1191039 is an equidigital number, since it uses as much as digits as its factorization.

1191039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397016.

The product of its (nonzero) digits is 243, while the sum is 24.

The square root of 1191039 is about 1091.3473324290. The cubic root of 1191039 is about 106.0006823262. Note that the first 3 decimals are identical.

The spelling of 1191039 in words is "one million, one hundred ninety-one thousand, thirty-nine".