1135681 has 4 divisors (see below), whose sum is σ = 1140912. Its totient is φ = 1130452.

The previous prime is 1135663. The next prime is 1135699. The reversal of 1135681 is 1865311.

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.

It is an interprime number because it is at equal distance from previous prime (1135663) and next prime (1135699).

It is a cyclic number.

It is not a de Polignac number, because 1135681 - 2¹¹ = 1133633 is a prime.

It is a super-2 number, since 2×1135681² = 2579542667522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1135081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2275 + ... + 2728.

It is an arithmetic number, because the mean of its divisors is an integer number (285228).

2^1135681 is an apocalyptic number.

It is an amenable number.

1135681 is a deficient number, since it is larger than the sum of its proper divisors (5231).

1135681 is an equidigital number, since it uses as much as digits as its factorization.

1135681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5230.

The product of its digits is 720, while the sum is 25.

The square root of 1135681 is about 1065.6833488424. The cubic root of 1135681 is about 104.3323012506.

It can be divided in two parts, 113568 and 1, that added together give a square (113569 = 337²).

The spelling of 1135681 in words is "one million, one hundred thirty-five thousand, six hundred eighty-one".