91598609 has 2 divisors, whose sum is σ = 91598610. Its totient is φ = 91598608.

The previous prime is 91598603. The next prime is 91598641. The reversal of 91598609 is 90689519.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59336209 + 32262400 = 7703^2 + 5680^2 .

It is a cyclic number.

It is not a de Polignac number, because 91598609 - 2⁴ = 91598593 is a prime.

It is not a weakly prime, because it can be changed into another prime (91598603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45799304 + 45799305.

It is an arithmetic number, because the mean of its divisors is an integer number (45799305).

Almost surely, 2^91598609 is an apocalyptic number.

It is an amenable number.

91598609 is a deficient number, since it is larger than the sum of its proper divisors (1).

91598609 is an equidigital number, since it uses as much as digits as its factorization.

91598609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 174960, while the sum is 47.

The square root of 91598609 is about 9570.7162218927. The cubic root of 91598609 is about 450.7782565534.

The spelling of 91598609 in words is "ninety-one million, five hundred ninety-eight thousand, six hundred nine".