91389159773 has 6 divisors (see below), whose sum is σ = 94649178234. Its totient is φ = 88237808624.

The previous prime is 91389159761. The next prime is 91389159787. The reversal of 91389159773 is 37795198319.

It can be written as a sum of positive squares in 3 ways, for example, as 1821838489 + 89567321284 = 42683^2 + 299278^2 .

It is not a de Polignac number, because 91389159773 - 2⁸ = 91389159517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91389179773) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54332786 + ... + 54334467.

It is an arithmetic number, because the mean of its divisors is an integer number (15774863039).

Almost surely, 2^91389159773 is an apocalyptic number.

It is an amenable number.

91389159773 is a deficient number, since it is larger than the sum of its proper divisors (3260018461).

91389159773 is a wasteful number, since it uses less digits than its factorization.

91389159773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108667311 (or 108667282 counting only the distinct ones).

The product of its digits is 12859560, while the sum is 62.

The spelling of 91389159773 in words is "ninety-one billion, three hundred eighty-nine million, one hundred fifty-nine thousand, seven hundred seventy-three".