91005000505 has 8 divisors (see below), whose sum is σ = 109207800000. Its totient is φ = 72802800816.

The previous prime is 91005000503. The next prime is 91005000517. The reversal of 91005000505 is 50500050019.

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 91005000505 - 2¹ = 91005000503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91005000505.

It is not an unprimeable number, because it can be changed into a prime (91005000503) 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, 314796 + ... + 530194.

It is an arithmetic number, because the mean of its divisors is an integer number (13650975000).

Almost surely, 2^91005000505 is an apocalyptic number.

It is an amenable number.

91005000505 is a deficient number, since it is larger than the sum of its proper divisors (18202799495).

91005000505 is a wasteful number, since it uses less digits than its factorization.

91005000505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299903.

The product of its (nonzero) digits is 1125, while the sum is 25.

The spelling of 91005000505 in words is "ninety-one billion, five million, five hundred five", and thus it is an aban number.