91105573505 has 8 divisors (see below), whose sum is σ = 111389456232. Its totient is φ = 71509280128.

The previous prime is 91105573411. The next prime is 91105573541. The reversal of 91105573505 is 50537550119.

It can be written as a sum of positive squares in 4 ways, for example, as 43114784881 + 47990788624 = 207641^2 + 219068^2 .

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 91105573505 - 2¹⁴ = 91105557121 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, 171897044 + ... + 171897573.

It is an arithmetic number, because the mean of its divisors is an integer number (13923682029).

Almost surely, 2^91105573505 is an apocalyptic number.

It is an amenable number.

91105573505 is a deficient number, since it is larger than the sum of its proper divisors (20283882727).

91105573505 is a wasteful number, since it uses less digits than its factorization.

91105573505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343794675.

The product of its (nonzero) digits is 118125, while the sum is 41.

The spelling of 91105573505 in words is "ninety-one billion, one hundred five million, five hundred seventy-three thousand, five hundred five".