91590532109 has 2 divisors, whose sum is σ = 91590532110. Its totient is φ = 91590532108.

The previous prime is 91590532013. The next prime is 91590532139. The reversal of 91590532109 is 90123509519.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71597986084 + 19992546025 = 267578^2 + 141395^2 .

It is a cyclic number.

It is not a de Polignac number, because 91590532109 - 2²⁴ = 91573754893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91590532109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91590532139) 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, 45795266054 + 45795266055.

It is an arithmetic number, because the mean of its divisors is an integer number (45795266055).

Almost surely, 2^91590532109 is an apocalyptic number.

It is an amenable number.

91590532109 is a deficient number, since it is larger than the sum of its proper divisors (1).

91590532109 is an equidigital number, since it uses as much as digits as its factorization.

91590532109 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 spelling of 91590532109 in words is "ninety-one billion, five hundred ninety million, five hundred thirty-two thousand, one hundred nine".