1091668 has 6 divisors (see below), whose sum is σ = 1910426. Its totient is φ = 545832.

The previous prime is 1091663. The next prime is 1091681. The reversal of 1091668 is 8661901.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 887364 + 204304 = 942^2 + 452^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091663) 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 as a sum of consecutive naturals, namely, 136455 + ... + 136462.

2^1091668 is an apocalyptic number.

It is an amenable number.

1091668 is a deficient number, since it is larger than the sum of its proper divisors (818758).

1091668 is a wasteful number, since it uses less digits than its factorization.

1091668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272921 (or 272919 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 1091668 is about 1044.8291726402. The cubic root of 1091668 is about 102.9667156097.

The spelling of 1091668 in words is "one million, ninety-one thousand, six hundred sixty-eight".