991648874 has 16 divisors (see below), whose sum is σ = 1568352480. Its totient is φ = 468951120.

The previous prime is 991648873. The next prime is 991648883. The reversal of 991648874 is 478846199.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (991648871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2009 + ... + 44579.

It is an arithmetic number, because the mean of its divisors is an integer number (98022030).

Almost surely, 2^991648874 is an apocalyptic number.

991648874 is a deficient number, since it is larger than the sum of its proper divisors (576703606).

991648874 is a wasteful number, since it uses less digits than its factorization.

991648874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43205.

The product of its digits is 3483648, while the sum is 56.

The square root of 991648874 is about 31490.4568718842. The cubic root of 991648874 is about 997.2085061462.

The spelling of 991648874 in words is "nine hundred ninety-one million, six hundred forty-eight thousand, eight hundred seventy-four".