991004995 has 8 divisors (see below), whose sum is σ = 1193595840. Its totient is φ = 789877440.

The previous prime is 991004923. The next prime is 991004999. The reversal of 991004995 is 599400199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 991004995 - 2⁷ = 991004867 is a prime.

It is a super-2 number, since 2×991004995² = 1964181800229900050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (991004999) 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 7 ways as a sum of consecutive naturals, for example, 364330 + ... + 367039.

It is an arithmetic number, because the mean of its divisors is an integer number (149199480).

Almost surely, 2^991004995 is an apocalyptic number.

991004995 is a deficient number, since it is larger than the sum of its proper divisors (202590845).

991004995 is a wasteful number, since it uses less digits than its factorization.

991004995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731645.

The product of its (nonzero) digits is 131220, while the sum is 46.

The square root of 991004995 is about 31480.2318129965. The cubic root of 991004995 is about 996.9926297909.

The spelling of 991004995 in words is "nine hundred ninety-one million, four thousand, nine hundred ninety-five".