28121701511 has 2 divisors, whose sum is σ = 28121701512. Its totient is φ = 28121701510.

The previous prime is 28121701501. The next prime is 28121701547. The reversal of 28121701511 is 11510712182.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28121701511 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28121701501) 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, 14060850755 + 14060850756.

It is an arithmetic number, because the mean of its divisors is an integer number (14060850756).

Almost surely, 2^28121701511 is an apocalyptic number.

28121701511 is a deficient number, since it is larger than the sum of its proper divisors (1).

28121701511 is an equidigital number, since it uses as much as digits as its factorization.

28121701511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 29.

The spelling of 28121701511 in words is "twenty-eight billion, one hundred twenty-one million, seven hundred one thousand, five hundred eleven".