91128203 has 2 divisors, whose sum is σ = 91128204. Its totient is φ = 91128202.

The previous prime is 91128133. The next prime is 91128209. The reversal of 91128203 is 30282119.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91128203 - 2¹⁸ = 90866059 is a prime.

It is not a weakly prime, because it can be changed into another prime (91128209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45564101 + 45564102.

It is an arithmetic number, because the mean of its divisors is an integer number (45564102).

Almost surely, 2^91128203 is an apocalyptic number.

91128203 is a deficient number, since it is larger than the sum of its proper divisors (1).

91128203 is an equidigital number, since it uses as much as digits as its factorization.

91128203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 91128203 is about 9546.1093121753. The cubic root of 91128203 is about 450.0052723662.

The spelling of 91128203 in words is "ninety-one million, one hundred twenty-eight thousand, two hundred three".