991479313 has 16 divisors (see below), whose sum is σ = 1096951680. Its totient is φ = 888624000.

The previous prime is 991479259. The next prime is 991479319. The reversal of 991479313 is 313974199.

It is a de Polignac number, because none of the positive numbers 2^k-991479313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (991479319) by changing a digit.

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, 387388 + ... + 389938.

It is an arithmetic number, because the mean of its divisors is an integer number (68559480).

Almost surely, 2^991479313 is an apocalyptic number.

It is an amenable number.

991479313 is a deficient number, since it is larger than the sum of its proper divisors (105472367).

991479313 is a wasteful number, since it uses less digits than its factorization.

991479313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3048.

The product of its digits is 183708, while the sum is 46.

The square root of 991479313 is about 31487.7644967057. The cubic root of 991479313 is about 997.1516656945.

The spelling of 991479313 in words is "nine hundred ninety-one million, four hundred seventy-nine thousand, three hundred thirteen".