1188091 has 4 divisors (see below), whose sum is σ = 1190272. Its totient is φ = 1185912.

The previous prime is 1188073. The next prime is 1188149. The reversal of 1188091 is 1908811.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1188091 - 2⁵ = 1188059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1188001) 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, 541 + ... + 1633.

It is an arithmetic number, because the mean of its divisors is an integer number (297568).

2^1188091 is an apocalyptic number.

1188091 is a deficient number, since it is larger than the sum of its proper divisors (2181).

1188091 is a wasteful number, since it uses less digits than its factorization.

1188091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180.

The product of its (nonzero) digits is 576, while the sum is 28.

The square root of 1188091 is about 1089.9958715518. The cubic root of 1188091 is about 105.9131542138.

The spelling of 1188091 in words is "one million, one hundred eighty-eight thousand, ninety-one".