1129681 has 8 divisors (see below), whose sum is σ = 1309824. Its totient is φ = 954240.

The previous prime is 1129679. The next prime is 1129693. The reversal of 1129681 is 1869211.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1129681 - 2¹ = 1129679 is a prime.

It is a super-2 number, since 2×1129681² = 2552358323522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1124681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 640 + ... + 1633.

It is an arithmetic number, because the mean of its divisors is an integer number (163728).

2^1129681 is an apocalyptic number.

It is an amenable number.

1129681 is a deficient number, since it is larger than the sum of its proper divisors (180143).

1129681 is an equidigital number, since it uses as much as digits as its factorization.

1129681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2351.

The product of its digits is 864, while the sum is 28.

The square root of 1129681 is about 1062.8645257040. The cubic root of 1129681 is about 104.1482415056.

It can be divided in two parts, 11 and 29681, that added together give a palindrome (29692).

The spelling of 1129681 in words is "one million, one hundred twenty-nine thousand, six hundred eighty-one".