91433026109 has 2 divisors, whose sum is σ = 91433026110. Its totient is φ = 91433026108.

The previous prime is 91433026081. The next prime is 91433026129. The reversal of 91433026109 is 90162033419.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54357523609 + 37075502500 = 233147^2 + 192550^2 .

It is an emirp because it is prime and its reverse (90162033419) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91433026109 - 2²⁸ = 91164590653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91433026129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45716513054 + 45716513055.

It is an arithmetic number, because the mean of its divisors is an integer number (45716513055).

Almost surely, 2^91433026109 is an apocalyptic number.

It is an amenable number.

91433026109 is a deficient number, since it is larger than the sum of its proper divisors (1).

91433026109 is an equidigital number, since it uses as much as digits as its factorization.

91433026109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 38.

The spelling of 91433026109 in words is "ninety-one billion, four hundred thirty-three million, twenty-six thousand, one hundred nine".