2191132779 has 8 divisors (see below), whose sum is σ = 3187102272. Its totient is φ = 1327959240.

The previous prime is 2191132759. The next prime is 2191132781. The reversal of 2191132779 is 9772311912.

It is a happy number.

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

It is not a de Polignac number, because 2191132779 - 2¹³ = 2191124587 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2191132779.

It is not an unprimeable number, because it can be changed into a prime (2191132759) 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, 33198949 + ... + 33199014.

It is an arithmetic number, because the mean of its divisors is an integer number (398387784).

Almost surely, 2^2191132779 is an apocalyptic number.

2191132779 is a deficient number, since it is larger than the sum of its proper divisors (995969493).

2191132779 is a wasteful number, since it uses less digits than its factorization.

2191132779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66397977.

The product of its digits is 47628, while the sum is 42.

The square root of 2191132779 is about 46809.5372653907. The cubic root of 2191132779 is about 1298.8417255059.

The spelling of 2191132779 in words is "two billion, one hundred ninety-one million, one hundred thirty-two thousand, seven hundred seventy-nine".