2191344631 has 6 divisors (see below), whose sum is σ = 2549115240. Its totient is φ = 1878295356.

The previous prime is 2191344607. The next prime is 2191344641. The reversal of 2191344631 is 1364431912.

It is not a de Polignac number, because 2191344631 - 2¹³ = 2191336439 is a prime.

It is a super-2 number, since 2×2191344631² = 9603982583625052322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191344641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22360611 + ... + 22360708.

It is an arithmetic number, because the mean of its divisors is an integer number (424852540).

Almost surely, 2^2191344631 is an apocalyptic number.

2191344631 is a deficient number, since it is larger than the sum of its proper divisors (357770609).

2191344631 is an equidigital number, since it uses as much as digits as its factorization.

2191344631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44721333 (or 44721326 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 2191344631 is about 46811.8001256094. The cubic root of 2191344631 is about 1298.8835841208.

The spelling of 2191344631 in words is "two billion, one hundred ninety-one million, three hundred forty-four thousand, six hundred thirty-one".