991107489 has 8 divisors (see below), whose sum is σ = 1324005472. Its totient is φ = 659473920.

The previous prime is 991107413. The next prime is 991107511. The reversal of 991107489 is 984701199.

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

It is not a de Polignac number, because 991107489 - 2¹¹ = 991105441 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (991177489) 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, 314272 + ... + 317409.

It is an arithmetic number, because the mean of its divisors is an integer number (165500684).

Almost surely, 2^991107489 is an apocalyptic number.

It is an amenable number.

991107489 is a deficient number, since it is larger than the sum of its proper divisors (332897983).

991107489 is a wasteful number, since it uses less digits than its factorization.

991107489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632207.

The product of its (nonzero) digits is 163296, while the sum is 48.

The square root of 991107489 is about 31481.8596814102. The cubic root of 991107489 is about 997.0269996950.

The spelling of 991107489 in words is "nine hundred ninety-one million, one hundred seven thousand, four hundred eighty-nine".