28601820251 has 2 divisors, whose sum is σ = 28601820252. Its totient is φ = 28601820250.

The previous prime is 28601820199. The next prime is 28601820271. The reversal of 28601820251 is 15202810682.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28601820251 is a prime.

It is not a weakly prime, because it can be changed into another prime (28601820271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14300910125 + 14300910126.

It is an arithmetic number, because the mean of its divisors is an integer number (14300910126).

Almost surely, 2^28601820251 is an apocalyptic number.

28601820251 is a deficient number, since it is larger than the sum of its proper divisors (1).

28601820251 is an equidigital number, since it uses as much as digits as its factorization.

28601820251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15360, while the sum is 35.

The spelling of 28601820251 in words is "twenty-eight billion, six hundred one million, eight hundred twenty thousand, two hundred fifty-one".