1091969 has 4 divisors (see below), whose sum is σ = 1095600. Its totient is φ = 1088340.

The previous prime is 1091957. The next prime is 1091983. The reversal of 1091969 is 9691901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1091969 - 2¹² = 1087873 is a prime.

It is a super-2 number, since 2×1091969² = 2384792593922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1091939) 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, 1319 + ... + 1980.

It is an arithmetic number, because the mean of its divisors is an integer number (273900).

2^1091969 is an apocalyptic number.

It is an amenable number.

1091969 is a deficient number, since it is larger than the sum of its proper divisors (3631).

1091969 is an equidigital number, since it uses as much as digits as its factorization.

1091969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3630.

The product of its (nonzero) digits is 4374, while the sum is 35.

The square root of 1091969 is about 1044.9732053981. The cubic root of 1091969 is about 102.9761782343.

The spelling of 1091969 in words is "one million, ninety-one thousand, nine hundred sixty-nine".