91173233 has 2 divisors, whose sum is σ = 91173234. Its totient is φ = 91173232.

The previous prime is 91173211. The next prime is 91173239. The reversal of 91173233 is 33237119.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87459904 + 3713329 = 9352^2 + 1927^2 .

It is a cyclic number.

It is not a de Polignac number, because 91173233 - 2⁶ = 91173169 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91173196 and 91173205.

It is not a weakly prime, because it can be changed into another prime (91173239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45586616 + 45586617.

It is an arithmetic number, because the mean of its divisors is an integer number (45586617).

Almost surely, 2^91173233 is an apocalyptic number.

It is an amenable number.

91173233 is a deficient number, since it is larger than the sum of its proper divisors (1).

91173233 is an equidigital number, since it uses as much as digits as its factorization.

91173233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402, while the sum is 29.

The square root of 91173233 is about 9548.4675733858. The cubic root of 91173233 is about 450.0793818807.

The spelling of 91173233 in words is "ninety-one million, one hundred seventy-three thousand, two hundred thirty-three".