91144648733 has 6 divisors (see below), whose sum is σ = 93421911162. Its totient is φ = 88921606880.

The previous prime is 91144648723. The next prime is 91144648739. The reversal of 91144648733 is 33784644119.

It can be written as a sum of positive squares in 3 ways, for example, as 3967362169 + 87177286564 = 62987^2 + 295258^2 .

It is not a de Polignac number, because 91144648733 - 2²⁶ = 91077539869 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 (91144648739) 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, 27108566 + ... + 27111927.

It is an arithmetic number, because the mean of its divisors is an integer number (15570318527).

Almost surely, 2^91144648733 is an apocalyptic number.

It is an amenable number.

91144648733 is a deficient number, since it is larger than the sum of its proper divisors (2277262429).

91144648733 is an equidigital number, since it uses as much as digits as its factorization.

91144648733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54220575 (or 54220534 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 50.

The spelling of 91144648733 in words is "ninety-one billion, one hundred forty-four million, six hundred forty-eight thousand, seven hundred thirty-three".