11172881 has 2 divisors, whose sum is σ = 11172882. Its totient is φ = 11172880.

The previous prime is 11172857. The next prime is 11172907. The reversal of 11172881 is 18827111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10660225 + 512656 = 3265^2 + 716^2 .

It is an emirp because it is prime and its reverse (18827111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11172881 is a prime.

It is a super-2 number, since 2×11172881² = 249666539680322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11172851) 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 as a sum of consecutive naturals, namely, 5586440 + 5586441.

It is an arithmetic number, because the mean of its divisors is an integer number (5586441).

Almost surely, 2^11172881 is an apocalyptic number.

It is an amenable number.

11172881 is a deficient number, since it is larger than the sum of its proper divisors (1).

11172881 is an equidigital number, since it uses as much as digits as its factorization.

11172881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 896, while the sum is 29.

The square root of 11172881 is about 3342.5859749601. The cubic root of 11172881 is about 223.5570607711.

Adding to 11172881 its reverse (18827111), we get a palindrome (29999992).

The spelling of 11172881 in words is "eleven million, one hundred seventy-two thousand, eight hundred eighty-one".