10991779 has 4 divisors (see below), whose sum is σ = 11015784. Its totient is φ = 10967776.

The previous prime is 10991777. The next prime is 10991791. The reversal of 10991779 is 97719901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97719901 = 6379 ⋅15319.

It is a cyclic number.

It is not a de Polignac number, because 10991779 - 2¹ = 10991777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10991777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11302 + ... + 12235.

It is an arithmetic number, because the mean of its divisors is an integer number (2753946).

Almost surely, 2^10991779 is an apocalyptic number.

10991779 is a deficient number, since it is larger than the sum of its proper divisors (24005).

10991779 is an equidigital number, since it uses as much as digits as its factorization.

10991779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24004.

The product of its (nonzero) digits is 35721, while the sum is 43.

The square root of 10991779 is about 3315.3851963233. The cubic root of 10991779 is about 222.3425911873.

The spelling of 10991779 in words is "ten million, nine hundred ninety-one thousand, seven hundred seventy-nine".