991329371 has 8 divisors (see below), whose sum is σ = 1044476160. Its totient is φ = 939019752.

The previous prime is 991329349. The next prime is 991329421. The reversal of 991329371 is 173923199.

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

It is a cyclic number.

It is not a de Polignac number, because 991329371 - 2⁶ = 991329307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991329071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206861 + ... + 211598.

It is an arithmetic number, because the mean of its divisors is an integer number (130559520).

Almost surely, 2^991329371 is an apocalyptic number.

991329371 is a deficient number, since it is larger than the sum of its proper divisors (53146789).

991329371 is a wasteful number, since it uses less digits than its factorization.

991329371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418585.

The product of its digits is 91854, while the sum is 44.

The square root of 991329371 is about 31485.3834501027. The cubic root of 991329371 is about 997.1013965493.

The spelling of 991329371 in words is "nine hundred ninety-one million, three hundred twenty-nine thousand, three hundred seventy-one".