2191836673 has 16 divisors (see below), whose sum is σ = 2566846800. Its totient is φ = 1852747776.

The previous prime is 2191836659. The next prime is 2191836701. The reversal of 2191836673 is 3766381912.

It can be written as a sum of positive squares in 8 ways, for example, as 19158129 + 2172678544 = 4377^2 + 46612^2 .

It is a cyclic number.

It is not a de Polignac number, because 2191836673 - 2⁵ = 2191836641 is a prime.

It is a super-2 number, since 2×2191836673² = 9608296002215417858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2191836623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125848 + ... + 142201.

It is an arithmetic number, because the mean of its divisors is an integer number (160427925).

Almost surely, 2^2191836673 is an apocalyptic number.

It is an amenable number.

2191836673 is a deficient number, since it is larger than the sum of its proper divisors (375010127).

2191836673 is a wasteful number, since it uses less digits than its factorization.

2191836673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268116.

The product of its digits is 326592, while the sum is 46.

The square root of 2191836673 is about 46817.0553644716. The cubic root of 2191836673 is about 1298.9807934535.

The spelling of 2191836673 in words is "two billion, one hundred ninety-one million, eight hundred thirty-six thousand, six hundred seventy-three".