11172381 has 16 divisors (see below), whose sum is σ = 16450560. Its totient is φ = 6687920.

The previous prime is 11172379. The next prime is 11172397. The reversal of 11172381 is 18327111.

It is a happy number.

11172381 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 11172381 - 2¹ = 11172379 is a prime.

It is a super-2 number, since 2×11172381² = 249644194418322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11172311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 700 + ... + 4778.

It is an arithmetic number, because the mean of its divisors is an integer number (1028160).

Almost surely, 2^11172381 is an apocalyptic number.

11172381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11172381 is a deficient number, since it is larger than the sum of its proper divisors (5278179).

11172381 is a wasteful number, since it uses less digits than its factorization.

11172381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4176.

The product of its digits is 336, while the sum is 24.

The square root of 11172381 is about 3342.5111817315. The cubic root of 11172381 is about 223.5537259047.

Adding to 11172381 its reverse (18327111), we get a palindrome (29499492).

The spelling of 11172381 in words is "eleven million, one hundred seventy-two thousand, three hundred eighty-one".