11431281 has 16 divisors (see below), whose sum is σ = 15902208. Its totient is φ = 7296000.

The previous prime is 11431279. The next prime is 11431283. The reversal of 11431281 is 18213411.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11431279) and next prime (11431283).

It is not a de Polignac number, because 11431281 - 2¹ = 11431279 is a prime.

It is a super-2 number, since 2×11431281² = 261348370601922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11431283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8785 + ... + 10001.

It is an arithmetic number, because the mean of its divisors is an integer number (993888).

Almost surely, 2^11431281 is an apocalyptic number.

It is an amenable number.

11431281 is a deficient number, since it is larger than the sum of its proper divisors (4470927).

11431281 is a wasteful number, since it uses less digits than its factorization.

11431281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1352.

The product of its digits is 192, while the sum is 21.

The square root of 11431281 is about 3381.0177461824. The cubic root of 11431281 is about 225.2673759684.

Adding to 11431281 its reverse (18213411), we get a palindrome (29644692).

The spelling of 11431281 in words is "eleven million, four hundred thirty-one thousand, two hundred eighty-one".