11538181 has 2 divisors, whose sum is σ = 11538182. Its totient is φ = 11538180.

The previous prime is 11538133. The next prime is 11538199. The reversal of 11538181 is 18183511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8946081 + 2592100 = 2991^2 + 1610^2 .

It is a cyclic number.

It is not a de Polignac number, because 11538181 - 2¹³ = 11529989 is a prime.

It is a super-2 number, since 2×11538181² = 266259241577522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11538101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5769090 + 5769091.

It is an arithmetic number, because the mean of its divisors is an integer number (5769091).

Almost surely, 2^11538181 is an apocalyptic number.

It is an amenable number.

11538181 is a deficient number, since it is larger than the sum of its proper divisors (1).

11538181 is an equidigital number, since it uses as much as digits as its factorization.

11538181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 28.

The square root of 11538181 is about 3396.7898080393. The cubic root of 11538181 is about 225.9673968161.

The spelling of 11538181 in words is "eleven million, five hundred thirty-eight thousand, one hundred eighty-one".