1135881 has 12 divisors (see below), whose sum is σ = 1668420. Its totient is φ = 744480.

The previous prime is 1135879. The next prime is 1135891. The reversal of 1135881 is 1885311.

It can be written as a sum of positive squares in 2 ways, for example, as 95481 + 1040400 = 309^2 + 1020^2 .

It is not a de Polignac number, because 1135881 - 2¹ = 1135879 is a prime.

It is a super-2 number, since 2×1135881² = 2580451292322, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1135831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 486 + ... + 1583.

It is an arithmetic number, because the mean of its divisors is an integer number (139035).

2^1135881 is an apocalyptic number.

It is an amenable number.

1135881 is a deficient number, since it is larger than the sum of its proper divisors (532539).

1135881 is a wasteful number, since it uses less digits than its factorization.

1135881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136 (or 2133 counting only the distinct ones).

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

The square root of 1135881 is about 1065.7771812157. Note that the first 3 decimals coincide. The cubic root of 1135881 is about 104.3384253986.

It can be divided in two parts, 1135 and 881, that added together give a triangular number (2016 = T₆₃).

The spelling of 1135881 in words is "one million, one hundred thirty-five thousand, eight hundred eighty-one".