991323006 has 32 divisors (see below), whose sum is σ = 2101075200. Its totient is φ = 310736256.

The previous prime is 991322999. The next prime is 991323019. The reversal of 991323006 is 600323199.

It is a congruent number.

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, 139225 + ... + 146171.

It is an arithmetic number, because the mean of its divisors is an integer number (65658600).

Almost surely, 2^991323006 is an apocalyptic number.

991323006 is an abundant number, since it is smaller than the sum of its proper divisors (1109752194).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

991323006 is a wasteful number, since it uses less digits than its factorization.

991323006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8368.

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 991323006 is about 31485.2823712921. The cubic root of 991323006 is about 997.0992625246.

The spelling of 991323006 in words is "nine hundred ninety-one million, three hundred twenty-three thousand, six".