991127665 has 8 divisors (see below), whose sum is σ = 1297476288. Its totient is φ = 720820080.

The previous prime is 991127653. The next prime is 991127671. The reversal of 991127665 is 566721199.

991127665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 991127665 - 2¹¹ = 991125617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9010197 + ... + 9010306.

It is an arithmetic number, because the mean of its divisors is an integer number (162184536).

Almost surely, 2^991127665 is an apocalyptic number.

It is an amenable number.

991127665 is a deficient number, since it is larger than the sum of its proper divisors (306348623).

991127665 is a wasteful number, since it uses less digits than its factorization.

991127665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18020519.

The product of its digits is 204120, while the sum is 46.

The square root of 991127665 is about 31482.1801182828. The cubic root of 991127665 is about 997.0337651503.

The spelling of 991127665 in words is "nine hundred ninety-one million, one hundred twenty-seven thousand, six hundred sixty-five".