28491851 has 2 divisors, whose sum is σ = 28491852. Its totient is φ = 28491850.

The previous prime is 28491839. The next prime is 28491863. The reversal of 28491851 is 15819482.

It is a balanced prime because it is at equal distance from previous prime (28491839) and next prime (28491863).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28491851 is a prime.

It is not a weakly prime, because it can be changed into another prime (28491751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14245925 + 14245926.

It is an arithmetic number, because the mean of its divisors is an integer number (14245926).

Almost surely, 2^28491851 is an apocalyptic number.

28491851 is a deficient number, since it is larger than the sum of its proper divisors (1).

28491851 is an equidigital number, since it uses as much as digits as its factorization.

28491851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 38.

The square root of 28491851 is about 5337.7758476729. The cubic root of 28491851 is about 305.4266214708.

The spelling of 28491851 in words is "twenty-eight million, four hundred ninety-one thousand, eight hundred fifty-one".