28193591 has 2 divisors, whose sum is σ = 28193592. Its totient is φ = 28193590.

The previous prime is 28193579. The next prime is 28193611. The reversal of 28193591 is 19539182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28193591 - 2¹⁴ = 28177207 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 (28193521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14096795 + 14096796.

It is an arithmetic number, because the mean of its divisors is an integer number (14096796).

Almost surely, 2^28193591 is an apocalyptic number.

28193591 is a deficient number, since it is larger than the sum of its proper divisors (1).

28193591 is an equidigital number, since it uses as much as digits as its factorization.

28193591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 38.

The square root of 28193591 is about 5309.7637423901. The cubic root of 28193591 is about 304.3571194137.

The spelling of 28193591 in words is "twenty-eight million, one hundred ninety-three thousand, five hundred ninety-one".