11211157 has 4 divisors (see below), whose sum is σ = 11230060. Its totient is φ = 11192256.

The previous prime is 11211133. The next prime is 11211169. The reversal of 11211157 is 75111211.

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 5262436 + 5948721 = 2294^2 + 2439^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211157 - 2⁷ = 11211029 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 (11211457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8532 + ... + 9757.

It is an arithmetic number, because the mean of its divisors is an integer number (2807515).

Almost surely, 2^11211157 is an apocalyptic number.

It is an amenable number.

11211157 is a deficient number, since it is larger than the sum of its proper divisors (18903).

11211157 is an equidigital number, since it uses as much as digits as its factorization.

11211157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18902.

The product of its digits is 70, while the sum is 19.

The square root of 11211157 is about 3348.3065869182. The cubic root of 11211157 is about 223.8120566924.

Adding to 11211157 its reverse (75111211), we get a palindrome (86322368).

It can be divided in two parts, 1121 and 1157, that added together give a triangular number (2278 = T₆₇).

The spelling of 11211157 in words is "eleven million, two hundred eleven thousand, one hundred fifty-seven".