11142181 has 2 divisors, whose sum is σ = 11142182. Its totient is φ = 11142180.

The previous prime is 11142107. The next prime is 11142211. The reversal of 11142181 is 18124111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10857025 + 285156 = 3295^2 + 534^2 .

It is a cyclic number.

It is not a de Polignac number, because 11142181 - 2¹⁷ = 11011109 is a prime.

It is a super-2 number, since 2×11142181² = 248296394873522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11142581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5571090 + 5571091.

It is an arithmetic number, because the mean of its divisors is an integer number (5571091).

Almost surely, 2^11142181 is an apocalyptic number.

It is an amenable number.

11142181 is a deficient number, since it is larger than the sum of its proper divisors (1).

11142181 is an equidigital number, since it uses as much as digits as its factorization.

11142181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64, while the sum is 19.

The square root of 11142181 is about 3337.9905631982. The cubic root of 11142181 is about 223.3521151997.

Adding to 11142181 its reverse (18124111), we get a palindrome (29266292).

The spelling of 11142181 in words is "eleven million, one hundred forty-two thousand, one hundred eighty-one".