91239491764 has 12 divisors (see below), whose sum is σ = 159671229088. Its totient is φ = 45619140600.

The previous prime is 91239491669. The next prime is 91239491789. The reversal of 91239491764 is 46719493219.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 487369 + ... + 648079.

Almost surely, 2^91239491764 is an apocalyptic number.

It is an amenable number.

91239491764 is a deficient number, since it is larger than the sum of its proper divisors (68431737324).

91239491764 is a wasteful number, since it uses less digits than its factorization.

91239491764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302646 (or 302644 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 55.

The spelling of 91239491764 in words is "ninety-one billion, two hundred thirty-nine million, four hundred ninety-one thousand, seven hundred sixty-four".