23281397549 has 2 divisors, whose sum is σ = 23281397550. Its totient is φ = 23281397548.

The previous prime is 23281397459. The next prime is 23281397561. The reversal of 23281397549 is 94579318232.

Together with previous prime (23281397459) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12278856100 + 11002541449 = 110810^2 + 104893^2 .

It is a cyclic number.

It is not a de Polignac number, because 23281397549 - 2¹² = 23281393453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23281397549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23281397569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11640698774 + 11640698775.

It is an arithmetic number, because the mean of its divisors is an integer number (11640698775).

Almost surely, 2^23281397549 is an apocalyptic number.

It is an amenable number.

23281397549 is a deficient number, since it is larger than the sum of its proper divisors (1).

23281397549 is an equidigital number, since it uses as much as digits as its factorization.

23281397549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 53.

The spelling of 23281397549 in words is "twenty-three billion, two hundred eighty-one million, three hundred ninety-seven thousand, five hundred forty-nine".