2191939133 has 4 divisors (see below), whose sum is σ = 2193449148. Its totient is φ = 2190429120.

The previous prime is 2191939129. The next prime is 2191939151. The reversal of 2191939133 is 3319391912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1821838489 + 370100644 = 42683^2 + 19238^2 .

It is a cyclic number.

It is not a de Polignac number, because 2191939133 - 2² = 2191939129 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191939333) 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, 752828 + ... + 755733.

It is an arithmetic number, because the mean of its divisors is an integer number (548362287).

Almost surely, 2^2191939133 is an apocalyptic number.

It is an amenable number.

2191939133 is a deficient number, since it is larger than the sum of its proper divisors (1510015).

2191939133 is a wasteful number, since it uses less digits than its factorization.

2191939133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510014.

The product of its digits is 39366, while the sum is 41.

The square root of 2191939133 is about 46818.1496110216. The cubic root of 2191939133 is about 1299.0010339364.

The spelling of 2191939133 in words is "two billion, one hundred ninety-one million, nine hundred thirty-nine thousand, one hundred thirty-three".