2191038023 has 2 divisors, whose sum is σ = 2191038024. Its totient is φ = 2191038022.

The previous prime is 2191038007. The next prime is 2191038049. The reversal of 2191038023 is 3208301912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2191038023 - 2⁴ = 2191038007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2191038823) 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 as a sum of consecutive naturals, namely, 1095519011 + 1095519012.

It is an arithmetic number, because the mean of its divisors is an integer number (1095519012).

Almost surely, 2^2191038023 is an apocalyptic number.

2191038023 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191038023 is an equidigital number, since it uses as much as digits as its factorization.

2191038023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 2191038023 is about 46808.5251102831. The cubic root of 2191038023 is about 1298.8230023410.

Adding to 2191038023 its reverse (3208301912), we get a palindrome (5399339935).

The spelling of 2191038023 in words is "two billion, one hundred ninety-one million, thirty-eight thousand, twenty-three".