9491288990505 has 16 divisors (see below), whose sum is σ = 17355499868544. Its totient is φ = 4338874967040.

The previous prime is 9491288990467. The next prime is 9491288990531. The reversal of 9491288990505 is 5050998821949.

It is not a de Polignac number, because 9491288990505 - 2⁹ = 9491288989993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9491288990505.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45196614136 + ... + 45196614345.

It is an arithmetic number, because the mean of its divisors is an integer number (1084718741784).

Almost surely, 2^{9491288990505} is an apocalyptic number.

It is an amenable number.

9491288990505 is a deficient number, since it is larger than the sum of its proper divisors (7864210878039).

9491288990505 is a wasteful number, since it uses less digits than its factorization.

9491288990505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90393228496.

The product of its (nonzero) digits is 83980800, while the sum is 69.

The spelling of 9491288990505 in words is "nine trillion, four hundred ninety-one billion, two hundred eighty-eight million, nine hundred ninety thousand, five hundred five".