1163281 has 4 divisors (see below), whose sum is σ = 1329472. Its totient is φ = 997092.

The previous prime is 1163273. The next prime is 1163311. The reversal of 1163281 is 1823611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1823611 = 149 ⋅12239.

It is a cyclic number.

It is not a de Polignac number, because 1163281 - 2³ = 1163273 is a prime.

It is a super-2 number, since 2×1163281² = 2706445369922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1163221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83085 + ... + 83098.

It is an arithmetic number, because the mean of its divisors is an integer number (332368).

2^1163281 is an apocalyptic number.

It is an amenable number.

1163281 is a deficient number, since it is larger than the sum of its proper divisors (166191).

1163281 is an equidigital number, since it uses as much as digits as its factorization.

1163281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166190.

The product of its digits is 288, while the sum is 22.

The square root of 1163281 is about 1078.5550519097. Note that the first 3 decimals coincide. The cubic root of 1163281 is about 105.1707275416.

Adding to 1163281 its reverse (1823611), we get a palindrome (2986892).

It can be divided in two parts, 1163 and 281, that added together give a square (1444 = 38²).

The spelling of 1163281 in words is "one million, one hundred sixty-three thousand, two hundred eighty-one".