91321289436 has 24 divisors (see below), whose sum is σ = 229474009744. Its totient is φ = 28098858240.

The previous prime is 91321289419. The next prime is 91321289453. The reversal of 91321289436 is 63498212319.

It is an interprime number because it is at equal distance from previous prime (91321289419) and next prime (91321289453).

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 7 ways as a sum of consecutive naturals, for example, 292696285 + ... + 292696596.

Almost surely, 2^91321289436 is an apocalyptic number.

It is an amenable number.

91321289436 is an abundant number, since it is smaller than the sum of its proper divisors (138152720308).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91321289436 is a wasteful number, since it uses less digits than its factorization.

91321289436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585392901 (or 585392899 counting only the distinct ones).

The product of its digits is 559872, while the sum is 48.

The spelling of 91321289436 in words is "ninety-one billion, three hundred twenty-one million, two hundred eighty-nine thousand, four hundred thirty-six".