91003573 has 2 divisors, whose sum is σ = 91003574. Its totient is φ = 91003572.

The previous prime is 91003543. The next prime is 91003579. The reversal of 91003573 is 37530019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88981489 + 2022084 = 9433^2 + 1422^2 .

It is an emirp because it is prime and its reverse (37530019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91003573 - 2⁵ = 91003541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91003579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45501786 + 45501787.

It is an arithmetic number, because the mean of its divisors is an integer number (45501787).

Almost surely, 2^91003573 is an apocalyptic number.

It is an amenable number.

91003573 is a deficient number, since it is larger than the sum of its proper divisors (1).

91003573 is an equidigital number, since it uses as much as digits as its factorization.

91003573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2835, while the sum is 28.

The square root of 91003573 is about 9539.5792884173. The cubic root of 91003573 is about 449.8000313167.

The spelling of 91003573 in words is "ninety-one million, three thousand, five hundred seventy-three".