28931645441 has 2 divisors, whose sum is σ = 28931645442. Its totient is φ = 28931645440.

The previous prime is 28931645437. The next prime is 28931645443. The reversal of 28931645441 is 14454613982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27211801600 + 1719843841 = 164960^2 + 41471^2 .

It is a cyclic number.

It is not a de Polignac number, because 28931645441 - 2² = 28931645437 is a prime.

Together with 28931645443, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28931645443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14465822720 + 14465822721.

It is an arithmetic number, because the mean of its divisors is an integer number (14465822721).

Almost surely, 2^28931645441 is an apocalyptic number.

It is an amenable number.

28931645441 is a deficient number, since it is larger than the sum of its proper divisors (1).

28931645441 is an equidigital number, since it uses as much as digits as its factorization.

28931645441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 829440, while the sum is 47.

The spelling of 28931645441 in words is "twenty-eight billion, nine hundred thirty-one million, six hundred forty-five thousand, four hundred forty-one".