91821052329 has 8 divisors (see below), whose sum is σ = 122429764800. Its totient is φ = 61213187376.

The previous prime is 91821052321. The next prime is 91821052343. The reversal of 91821052329 is 92325012819.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91821052329 - 2³ = 91821052321 is a prime.

It is a super-2 number, since 2×91821052329² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91821052321) by changing a digit.

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, 111372 + ... + 442770.

It is an arithmetic number, because the mean of its divisors is an integer number (15303720600).

Almost surely, 2^91821052329 is an apocalyptic number.

It is an amenable number.

91821052329 is a deficient number, since it is larger than the sum of its proper divisors (30608712471).

91821052329 is a wasteful number, since it uses less digits than its factorization.

91821052329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423759.

The product of its (nonzero) digits is 77760, while the sum is 42.

The spelling of 91821052329 in words is "ninety-one billion, eight hundred twenty-one million, fifty-two thousand, three hundred twenty-nine".