28191959 has 2 divisors, whose sum is σ = 28191960. Its totient is φ = 28191958.

The previous prime is 28191949. The next prime is 28191971. The reversal of 28191959 is 95919182.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28191959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28191929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14095979 + 14095980.

It is an arithmetic number, because the mean of its divisors is an integer number (14095980).

Almost surely, 2^28191959 is an apocalyptic number.

28191959 is a deficient number, since it is larger than the sum of its proper divisors (1).

28191959 is an equidigital number, since it uses as much as digits as its factorization.

28191959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 44.

The square root of 28191959 is about 5309.6100610120. The cubic root of 28191959 is about 304.3512466794.

The spelling of 28191959 in words is "twenty-eight million, one hundred ninety-one thousand, nine hundred fifty-nine".