28941857251 has 2 divisors, whose sum is σ = 28941857252. Its totient is φ = 28941857250.

The previous prime is 28941857249. The next prime is 28941857299. The reversal of 28941857251 is 15275814982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28941857251 - 2¹ = 28941857249 is a prime.

It is a super-2 number, since 2×28941857251² (a number of 22 digits) contains 22 as substring.

Together with 28941857249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28941857551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14470928625 + 14470928626.

It is an arithmetic number, because the mean of its divisors is an integer number (14470928626).

Almost surely, 2^28941857251 is an apocalyptic number.

28941857251 is a deficient number, since it is larger than the sum of its proper divisors (1).

28941857251 is an equidigital number, since it uses as much as digits as its factorization.

28941857251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1612800, while the sum is 52.

The spelling of 28941857251 in words is "twenty-eight billion, nine hundred forty-one million, eight hundred fifty-seven thousand, two hundred fifty-one".