991824145 has 16 divisors (see below), whose sum is σ = 1284034752. Its totient is φ = 731113920.

The previous prime is 991824133. The next prime is 991824167. The reversal of 991824145 is 541428199.

It is a de Polignac number, because none of the positive numbers 2^k-991824145 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23754 + ... + 50476.

It is an arithmetic number, because the mean of its divisors is an integer number (80252172).

Almost surely, 2^991824145 is an apocalyptic number.

It is an amenable number.

991824145 is a deficient number, since it is larger than the sum of its proper divisors (292210607).

991824145 is a wasteful number, since it uses less digits than its factorization.

991824145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27312.

The product of its digits is 103680, while the sum is 43.

The square root of 991824145 is about 31493.2396713961. The cubic root of 991824145 is about 997.2672539014.

The spelling of 991824145 in words is "nine hundred ninety-one million, eight hundred twenty-four thousand, one hundred forty-five".