91605223 has 2 divisors, whose sum is σ = 91605224. Its totient is φ = 91605222.

The previous prime is 91605203. The next prime is 91605233. The reversal of 91605223 is 32250619.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91605223 - 2²¹ = 89508071 is a prime.

It is equal to p_5304709 and since 91605223 and 5304709 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 91605191 and 91605200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91605203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45802611 + 45802612.

It is an arithmetic number, because the mean of its divisors is an integer number (45802612).

Almost surely, 2^91605223 is an apocalyptic number.

91605223 is a deficient number, since it is larger than the sum of its proper divisors (1).

91605223 is an equidigital number, since it uses as much as digits as its factorization.

91605223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 91605223 is about 9571.0617488343. The cubic root of 91605223 is about 450.7891059745.

The spelling of 91605223 in words is "ninety-one million, six hundred five thousand, two hundred twenty-three".