991329006 has 8 divisors (see below), whose sum is σ = 1982658024. Its totient is φ = 330443000.

The previous prime is 991328951. The next prime is 991329061. The reversal of 991329006 is 600923199.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (991328951) and next prime (991329061).

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

991329006 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82610745 + ... + 82610756.

It is an arithmetic number, because the mean of its divisors is an integer number (247832253).

Almost surely, 2^991329006 is an apocalyptic number.

991329006 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

991329006 is a wasteful number, since it uses less digits than its factorization.

991329006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165221506.

The product of its (nonzero) digits is 26244, while the sum is 39.

The square root of 991329006 is about 31485.3776537618. The cubic root of 991329006 is about 997.1012741742.

The spelling of 991329006 in words is "nine hundred ninety-one million, three hundred twenty-nine thousand, six".