91100025505 has 8 divisors (see below), whose sum is σ = 111645988992. Its totient is φ = 71329381488.

The previous prime is 91100025473. The next prime is 91100025529. The reversal of 91100025505 is 50552000119.

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 91100025505 - 2⁵ = 91100025473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193829607 + ... + 193830076.

It is an arithmetic number, because the mean of its divisors is an integer number (13955748624).

Almost surely, 2^91100025505 is an apocalyptic number.

It is an amenable number.

91100025505 is a deficient number, since it is larger than the sum of its proper divisors (20545963487).

91100025505 is a wasteful number, since it uses less digits than its factorization.

91100025505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387659735.

The product of its (nonzero) digits is 2250, while the sum is 28.

The spelling of 91100025505 in words is "ninety-one billion, one hundred million, twenty-five thousand, five hundred five".