91605959 has 2 divisors, whose sum is σ = 91605960. Its totient is φ = 91605958.

The previous prime is 91605929. The next prime is 91605967. The reversal of 91605959 is 95950619.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91605959 - 2¹² = 91601863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91605919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45802979 + 45802980.

It is an arithmetic number, because the mean of its divisors is an integer number (45802980).

Almost surely, 2^91605959 is an apocalyptic number.

91605959 is a deficient number, since it is larger than the sum of its proper divisors (1).

91605959 is an equidigital number, since it uses as much as digits as its factorization.

91605959 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 109350, while the sum is 44.

The square root of 91605959 is about 9571.1001979919. The cubic root of 91605959 is about 450.7903132561.

The spelling of 91605959 in words is "ninety-one million, six hundred five thousand, nine hundred fifty-nine".