23138204591 has 2 divisors, whose sum is σ = 23138204592. Its totient is φ = 23138204590.

The previous prime is 23138204561. The next prime is 23138204629. The reversal of 23138204591 is 19540283132.

It is an a-pointer prime, because the next prime (23138204629) can be obtained adding 23138204591 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23138204591 - 2²² = 23134010287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23138204521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11569102295 + 11569102296.

It is an arithmetic number, because the mean of its divisors is an integer number (11569102296).

Almost surely, 2^23138204591 is an apocalyptic number.

23138204591 is a deficient number, since it is larger than the sum of its proper divisors (1).

23138204591 is an equidigital number, since it uses as much as digits as its factorization.

23138204591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 23138204591 in words is "twenty-three billion, one hundred thirty-eight million, two hundred four thousand, five hundred ninety-one".