11571121 has 8 divisors (see below), whose sum is σ = 11937320. Its totient is φ = 11207808.

The previous prime is 11571107. The next prime is 11571163. The reversal of 11571121 is 12117511.

11571121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 442225 + 11128896 = 665^2 + 3336^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 11571121 - 2⁵ = 11571089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11571181) 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, 9685 + ... + 10813.

It is an arithmetic number, because the mean of its divisors is an integer number (1492165).

Almost surely, 2^11571121 is an apocalyptic number.

It is an amenable number.

11571121 is a deficient number, since it is larger than the sum of its proper divisors (366199).

11571121 is a wasteful number, since it uses less digits than its factorization.

11571121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443.

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

The square root of 11571121 is about 3401.6350480320. The cubic root of 11571121 is about 226.1822283101.

Adding to 11571121 its reverse (12117511), we get a palindrome (23688632).

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

The spelling of 11571121 in words is "eleven million, five hundred seventy-one thousand, one hundred twenty-one".