1115681 has 6 divisors (see below), whose sum is σ = 1297890. Its totient is φ = 956256.

The previous prime is 1115657. The next prime is 1115683. The reversal of 1115681 is 1865111.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 625681 + 490000 = 791^2 + 700^2 .

It is not a de Polignac number, because 1115681 - 2¹⁰ = 1114657 is a prime.

It is a super-2 number, since 2×1115681² = 2489488187522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1115683) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11336 + ... + 11433.

It is an arithmetic number, because the mean of its divisors is an integer number (216315).

2^1115681 is an apocalyptic number.

It is an amenable number.

1115681 is a deficient number, since it is larger than the sum of its proper divisors (182209).

1115681 is an equidigital number, since it uses as much as digits as its factorization.

1115681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22783 (or 22776 counting only the distinct ones).

The product of its digits is 240, while the sum is 23.

The square root of 1115681 is about 1056.2580177210. The cubic root of 1115681 is about 103.7162197085.

The spelling of 1115681 in words is "one million, one hundred fifteen thousand, six hundred eighty-one".