23278711591 has 2 divisors, whose sum is σ = 23278711592. Its totient is φ = 23278711590.

The previous prime is 23278711559. The next prime is 23278711637. The reversal of 23278711591 is 19511787232.

It is an a-pointer prime, because the next prime (23278711637) can be obtained adding 23278711591 to its sum of digits (46).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23278711591 - 2⁵ = 23278711559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23278711531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11639355795 + 11639355796.

It is an arithmetic number, because the mean of its divisors is an integer number (11639355796).

Almost surely, 2^23278711591 is an apocalyptic number.

23278711591 is a deficient number, since it is larger than the sum of its proper divisors (1).

23278711591 is an equidigital number, since it uses as much as digits as its factorization.

23278711591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 46.

The spelling of 23278711591 in words is "twenty-three billion, two hundred seventy-eight million, seven hundred eleven thousand, five hundred ninety-one".