91234405687 has 8 divisors (see below), whose sum is σ = 94367014560. Its totient is φ = 88145005440.

The previous prime is 91234405627. The next prime is 91234405729. The reversal of 91234405687 is 78650443219.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91234405687 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91234405687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91234405607) 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, 10797862 + ... + 10806307.

It is an arithmetic number, because the mean of its divisors is an integer number (11795876820).

It is a 1-persistent number, because it is pandigital, but 2⋅91234405687 = 182468811374 is not.

Almost surely, 2^91234405687 is an apocalyptic number.

91234405687 is a deficient number, since it is larger than the sum of its proper divisors (3132608873).

91234405687 is a wasteful number, since it uses less digits than its factorization.

91234405687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21604313.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 91234405687 in words is "ninety-one billion, two hundred thirty-four million, four hundred five thousand, six hundred eighty-seven".