1091993 has 8 divisors (see below), whose sum is σ = 1254912. Its totient is φ = 930816.

The previous prime is 1091983. The next prime is 1092019. The reversal of 1091993 is 3991901.

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

It is a cyclic number.

It is not a de Polignac number, because 1091993 - 2⁸ = 1091737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1091983) 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, 1496 + ... + 2102.

It is an arithmetic number, because the mean of its divisors is an integer number (156864).

2^1091993 is an apocalyptic number.

It is an amenable number.

1091993 is a deficient number, since it is larger than the sum of its proper divisors (162919).

1091993 is an equidigital number, since it uses as much as digits as its factorization.

1091993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871.

The product of its (nonzero) digits is 2187, while the sum is 32.

The square root of 1091993 is about 1044.9846888830. The cubic root of 1091993 is about 102.9769326544.

Adding to 1091993 its sum of digits (32), we get a square (1092025 = 1045²).

The spelling of 1091993 in words is "one million, ninety-one thousand, nine hundred ninety-three".