91641233 has 2 divisors, whose sum is σ = 91641234. Its totient is φ = 91641232.

The previous prime is 91641217. The next prime is 91641241. The reversal of 91641233 is 33214619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85525504 + 6115729 = 9248^2 + 2473^2 .

It is a cyclic number.

It is not a de Polignac number, because 91641233 - 2⁴ = 91641217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91641196 and 91641205.

It is not a weakly prime, because it can be changed into another prime (91641283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45820616 + 45820617.

It is an arithmetic number, because the mean of its divisors is an integer number (45820617).

Almost surely, 2^91641233 is an apocalyptic number.

It is an amenable number.

91641233 is a deficient number, since it is larger than the sum of its proper divisors (1).

91641233 is an equidigital number, since it uses as much as digits as its factorization.

91641233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 29.

The square root of 91641233 is about 9572.9427554958. The cubic root of 91641233 is about 450.8481666139.

The spelling of 91641233 in words is "ninety-one million, six hundred forty-one thousand, two hundred thirty-three".