1161157 has 4 divisors (see below), whose sum is σ = 1169100. Its totient is φ = 1153216.

The previous prime is 1161143. The next prime is 1161163. The reversal of 1161157 is 7511611.

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

It can be written as a sum of positive squares in 2 ways, for example, as 690561 + 470596 = 831^2 + 686^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1161157 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 (1161107) 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, 3748 + ... + 4045.

It is an arithmetic number, because the mean of its divisors is an integer number (292275).

2^1161157 is an apocalyptic number.

It is an amenable number.

1161157 is a deficient number, since it is larger than the sum of its proper divisors (7943).

1161157 is an equidigital number, since it uses as much as digits as its factorization.

1161157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7942.

The product of its digits is 210, while the sum is 22.

The square root of 1161157 is about 1077.5699513257. The cubic root of 1161157 is about 105.1066791820.

Adding to 1161157 its reverse (7511611), we get a palindrome (8672768).

The spelling of 1161157 in words is "one million, one hundred sixty-one thousand, one hundred fifty-seven".