1181157 has 8 divisors (see below), whose sum is σ = 1608576. Its totient is φ = 770592.

The previous prime is 1181153. The next prime is 1181171. The reversal of 1181157 is 7511811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1181157 - 2² = 1181153 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4048 + ... + 4329.

It is an arithmetic number, because the mean of its divisors is an integer number (201072).

2^1181157 is an apocalyptic number.

It is an amenable number.

1181157 is a deficient number, since it is larger than the sum of its proper divisors (427419).

1181157 is an equidigital number, since it uses as much as digits as its factorization.

1181157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8427.

The product of its digits is 280, while the sum is 24.

The square root of 1181157 is about 1086.8104710574. The cubic root of 1181157 is about 105.7067067334.

Adding to 1181157 its reverse (7511811), we get a palindrome (8692968).

It can be divided in two parts, 118 and 1157, that added together give a triangular number (1275 = T₅₀).

The spelling of 1181157 in words is "one million, one hundred eighty-one thousand, one hundred fifty-seven".