1157191 has 4 divisors (see below), whose sum is σ = 1322512. Its totient is φ = 991872.

The previous prime is 1157183. The next prime is 1157201. The reversal of 1157191 is 1917511.

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

It is not a de Polignac number, because 1157191 - 2³ = 1157183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157111) 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, 82650 + ... + 82663.

It is an arithmetic number, because the mean of its divisors is an integer number (330628).

2^1157191 is an apocalyptic number.

1157191 is a deficient number, since it is larger than the sum of its proper divisors (165321).

1157191 is an equidigital number, since it uses as much as digits as its factorization.

1157191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165320.

The product of its digits is 315, while the sum is 25.

The square root of 1157191 is about 1075.7281255038. The cubic root of 1157191 is about 104.9868766667.

The spelling of 1157191 in words is "one million, one hundred fifty-seven thousand, one hundred ninety-one".