1091779 has 4 divisors (see below), whose sum is σ = 1175776. Its totient is φ = 1007784.

The previous prime is 1091777. The next prime is 1091807. The reversal of 1091779 is 9771901.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9771901 = 113 ⋅86477.

It is a cyclic number.

It is not a de Polignac number, because 1091779 - 2¹ = 1091777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1091777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41979 + ... + 42004.

It is an arithmetic number, because the mean of its divisors is an integer number (293944).

2^1091779 is an apocalyptic number.

1091779 is a deficient number, since it is larger than the sum of its proper divisors (83997).

1091779 is an equidigital number, since it uses as much as digits as its factorization.

1091779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83996.

The product of its (nonzero) digits is 3969, while the sum is 34.

The square root of 1091779 is about 1044.8822900212. The cubic root of 1091779 is about 102.9702053515.

The spelling of 1091779 in words is "one million, ninety-one thousand, seven hundred seventy-nine".