11172681 has 32 divisors (see below), whose sum is σ = 18032000. Its totient is φ = 6796224.

The previous prime is 11172677. The next prime is 11172683. The reversal of 11172681 is 18627111.

It is not a de Polignac number, because 11172681 - 2² = 11172677 is a prime.

It is a super-2 number, since 2×11172681² = 249657601455522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11172683) 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 31 ways as a sum of consecutive naturals, for example, 48675 + ... + 48903.

It is an arithmetic number, because the mean of its divisors is an integer number (563500).

Almost surely, 2^11172681 is an apocalyptic number.

It is an amenable number.

11172681 is a deficient number, since it is larger than the sum of its proper divisors (6859319).

11172681 is a wasteful number, since it uses less digits than its factorization.

11172681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390 (or 384 counting only the distinct ones).

The product of its digits is 672, while the sum is 27.

The square root of 11172681 is about 3342.5560578695. The cubic root of 11172681 is about 223.5557268365. Note that the first 3 decimals are identical.

Adding to 11172681 its reverse (18627111), we get a palindrome (29799792).

The spelling of 11172681 in words is "eleven million, one hundred seventy-two thousand, six hundred eighty-one".