11145681 has 14 divisors (see below), whose sum is σ = 16711970. Its totient is φ = 7429968.

The previous prime is 11145679. The next prime is 11145689. The reversal of 11145681 is 18654111.

It can be written as a sum of positive squares in only one way, i.e., 9979281 + 1166400 = 3159^2 + 1080^2 .

It is not a de Polignac number, because 11145681 - 2¹ = 11145679 is a prime.

It is a super-2 number, since 2×11145681² = 248452409907522, 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 (11145689) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 6916 + ... + 8373.

Almost surely, 2^11145681 is an apocalyptic number.

It is an amenable number.

11145681 is a deficient number, since it is larger than the sum of its proper divisors (5566289).

11145681 is an frugal number, since it uses more digits than its factorization.

11145681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15307 (or 15292 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 11145681 is about 3338.5147895434. The cubic root of 11145681 is about 223.3754993279.

Adding to 11145681 its reverse (18654111), we get a palindrome (29799792).

The spelling of 11145681 in words is "eleven million, one hundred forty-five thousand, six hundred eighty-one".