28481191 has 2 divisors, whose sum is σ = 28481192. Its totient is φ = 28481190.

The previous prime is 28481149. The next prime is 28481207. The reversal of 28481191 is 19118482.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28481191 - 2⁹ = 28480679 is a prime.

It is a super-2 number, since 2×28481191² = 1622356481556962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28481491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14240595 + 14240596.

It is an arithmetic number, because the mean of its divisors is an integer number (14240596).

Almost surely, 2^28481191 is an apocalyptic number.

28481191 is a deficient number, since it is larger than the sum of its proper divisors (1).

28481191 is an equidigital number, since it uses as much as digits as its factorization.

28481191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 34.

The square root of 28481191 is about 5336.7772110142. Note that the first 3 decimals coincide. The cubic root of 28481191 is about 305.3885257370.

The spelling of 28481191 in words is "twenty-eight million, four hundred eighty-one thousand, one hundred ninety-one".