91729489639 has 8 divisors (see below), whose sum is σ = 91836633152. Its totient is φ = 91622400480.

The previous prime is 91729489613. The next prime is 91729489681. The reversal of 91729489639 is 93698492719.

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

It is a cyclic number.

It is not a de Polignac number, because 91729489639 - 2⁹ = 91729489127 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 (91729489609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4043749 + ... + 4066369.

It is an arithmetic number, because the mean of its divisors is an integer number (11479579144).

Almost surely, 2^91729489639 is an apocalyptic number.

91729489639 is a deficient number, since it is larger than the sum of its proper divisors (107143513).

91729489639 is a wasteful number, since it uses less digits than its factorization.

91729489639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27177.

The product of its digits is 52907904, while the sum is 67.

The spelling of 91729489639 in words is "ninety-one billion, seven hundred twenty-nine million, four hundred eighty-nine thousand, six hundred thirty-nine".