1091564 has 12 divisors (see below), whose sum is σ = 1939224. Its totient is φ = 537504.

The previous prime is 1091561. The next prime is 1091581. The reversal of 1091564 is 4651901.

It is not an unprimeable number, because it can be changed into a prime (1091561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1769 + ... + 2304.

It is an arithmetic number, because the mean of its divisors is an integer number (161602).

2^1091564 is an apocalyptic number.

It is an amenable number.

1091564 is a deficient number, since it is larger than the sum of its proper divisors (847660).

1091564 is a wasteful number, since it uses less digits than its factorization.

1091564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4144 (or 4142 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1091564 is about 1044.7794025535. The cubic root of 1091564 is about 102.9634457272.

The spelling of 1091564 in words is "one million, ninety-one thousand, five hundred sixty-four".