9028991 has 2 divisors, whose sum is σ = 9028992. Its totient is φ = 9028990.

The previous prime is 9028973. The next prime is 9028997. The reversal of 9028991 is 1998209.

It is a strong prime.

It is an emirp because it is prime and its reverse (1998209) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9028991 - 2⁶ = 9028927 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9028997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4514495 + 4514496.

It is an arithmetic number, because the mean of its divisors is an integer number (4514496).

Almost surely, 2^9028991 is an apocalyptic number.

9028991 is a deficient number, since it is larger than the sum of its proper divisors (1).

9028991 is an equidigital number, since it uses as much as digits as its factorization.

9028991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 9028991 is about 3004.8279484856. The cubic root of 9028991 is about 208.2314899911.

The spelling of 9028991 in words is "nine million, twenty-eight thousand, nine hundred ninety-one".