91433138605 has 4 divisors (see below), whose sum is σ = 109719766332. Its totient is φ = 73146510880.

The previous prime is 91433138597. The next prime is 91433138617. The reversal of 91433138605 is 50683133419.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31234553289 + 60198585316 = 176733^2 + 245354^2 .

It is not a de Polignac number, because 91433138605 - 2³ = 91433138597 is a prime.

It is a super-2 number, since 2×91433138605² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9143313856 + ... + 9143313865.

It is an arithmetic number, because the mean of its divisors is an integer number (27429941583).

Almost surely, 2^91433138605 is an apocalyptic number.

It is an amenable number.

91433138605 is a deficient number, since it is larger than the sum of its proper divisors (18286627727).

91433138605 is a wasteful number, since it uses less digits than its factorization.

91433138605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18286627726.

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 91433138605 in words is "ninety-one billion, four hundred thirty-three million, one hundred thirty-eight thousand, six hundred five".