11157 has 4 divisors (see below), whose sum is σ = 14880. Its totient is φ = 7436.

The previous prime is 11149. The next prime is 11159. The reversal of 11157 is 75111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75111 = 3 ⋅25037.

It is a cyclic number.

It is not a de Polignac number, because 11157 - 2³ = 11149 is a prime.

It is a D-number.

11157 is a lucky number.

It is a plaindrome in base 10 and base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11159) 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, 1857 + ... + 1862.

It is an arithmetic number, because the mean of its divisors is an integer number (3720).

2¹¹¹⁵⁷ is an apocalyptic number.

It is an amenable number.

11157 is a deficient number, since it is larger than the sum of its proper divisors (3723).

11157 is an equidigital number, since it uses as much as digits as its factorization.

11157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3722.

The product of its digits is 35, while the sum is 15.

The square root of 11157 is about 105.6267011697. The cubic root of 11157 is about 22.3451090099.

Adding to 11157 its reverse (75111), we get a palindrome (86268).

The spelling of 11157 in words is "eleven thousand, one hundred fifty-seven".