28231655791 has 2 divisors, whose sum is σ = 28231655792. Its totient is φ = 28231655790.

The previous prime is 28231655789. The next prime is 28231655797. The reversal of 28231655791 is 19755613282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28231655791 - 2¹ = 28231655789 is a prime.

Together with 28231655789, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28231655797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14115827895 + 14115827896.

It is an arithmetic number, because the mean of its divisors is an integer number (14115827896).

Almost surely, 2^28231655791 is an apocalyptic number.

28231655791 is a deficient number, since it is larger than the sum of its proper divisors (1).

28231655791 is an equidigital number, since it uses as much as digits as its factorization.

28231655791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 49.

The spelling of 28231655791 in words is "twenty-eight billion, two hundred thirty-one million, six hundred fifty-five thousand, seven hundred ninety-one".