1191859 has 4 divisors (see below), whose sum is σ = 1212120. Its totient is φ = 1171600.

The previous prime is 1191847. The next prime is 1191899. The reversal of 1191859 is 9581911.

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 1191859 - 2⁷ = 1191731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1191809) 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, 10042 + ... + 10159.

It is an arithmetic number, because the mean of its divisors is an integer number (303030).

2^1191859 is an apocalyptic number.

1191859 is a deficient number, since it is larger than the sum of its proper divisors (20261).

1191859 is an equidigital number, since it uses as much as digits as its factorization.

1191859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20260.

The product of its digits is 3240, while the sum is 34.

The square root of 1191859 is about 1091.7229502030. The cubic root of 1191859 is about 106.0250030019.

The spelling of 1191859 in words is "one million, one hundred ninety-one thousand, eight hundred fifty-nine".