1127681 has 4 divisors (see below), whose sum is σ = 1149012. Its totient is φ = 1106352.

The previous prime is 1127663. The next prime is 1127683. The reversal of 1127681 is 1867211.

1127681 = 46² + 47² + ... + 151².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 379456 + 748225 = 616^2 + 865^2 .

It is a cyclic number.

It is not a de Polignac number, because 1127681 - 2⁶ = 1127617 is a prime.

It is a super-2 number, since 2×1127681² = 2543328875522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1127681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1127683) 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, 10586 + ... + 10691.

It is an arithmetic number, because the mean of its divisors is an integer number (287253).

2^1127681 is an apocalyptic number.

It is an amenable number.

1127681 is a deficient number, since it is larger than the sum of its proper divisors (21331).

1127681 is an equidigital number, since it uses as much as digits as its factorization.

1127681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21330.

The product of its digits is 672, while the sum is 26.

The square root of 1127681 is about 1061.9232552308. The cubic root of 1127681 is about 104.0867434580.

The spelling of 1127681 in words is "one million, one hundred twenty-seven thousand, six hundred eighty-one".