91391203 has 2 divisors, whose sum is σ = 91391204. Its totient is φ = 91391202.

The previous prime is 91391191. The next prime is 91391207. The reversal of 91391203 is 30219319.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91391203 - 2¹³ = 91383011 is a prime.

It is not a weakly prime, because it can be changed into another prime (91391207) 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, 45695601 + 45695602.

It is an arithmetic number, because the mean of its divisors is an integer number (45695602).

Almost surely, 2^91391203 is an apocalyptic number.

91391203 is a deficient number, since it is larger than the sum of its proper divisors (1).

91391203 is an equidigital number, since it uses as much as digits as its factorization.

91391203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 91391203 is about 9559.8746330692. The cubic root of 91391203 is about 450.4377682316.

The spelling of 91391203 in words is "ninety-one million, three hundred ninety-one thousand, two hundred three".