28116251 has 2 divisors, whose sum is σ = 28116252. Its totient is φ = 28116250.

The previous prime is 28116241. The next prime is 28116259. The reversal of 28116251 is 15261182.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28116251 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is equal to p_1748213 and since 28116251 and 1748213 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28116251.

It is not a weakly prime, because it can be changed into another prime (28116259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14058125 + 14058126.

It is an arithmetic number, because the mean of its divisors is an integer number (14058126).

Almost surely, 2^28116251 is an apocalyptic number.

28116251 is a deficient number, since it is larger than the sum of its proper divisors (1).

28116251 is an equidigital number, since it uses as much as digits as its factorization.

28116251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 26.

The square root of 28116251 is about 5302.4759311099. The cubic root of 28116251 is about 304.0785627689.

The spelling of 28116251 in words is "twenty-eight million, one hundred sixteen thousand, two hundred fifty-one".