9991377 has 16 divisors (see below), whose sum is σ = 16148160. Its totient is φ = 6055200.

The previous prime is 9991357. The next prime is 9991379. The reversal of 9991377 is 7731999.

It is not a de Polignac number, because 9991377 - 2⁶ = 9991313 is a prime.

It is a super-2 number, since 2×9991377² = 199655228712258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9991379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16524 + ... + 17117.

It is an arithmetic number, because the mean of its divisors is an integer number (1009260).

Almost surely, 2^9991377 is an apocalyptic number.

It is an amenable number.

9991377 is a deficient number, since it is larger than the sum of its proper divisors (6156783).

9991377 is a wasteful number, since it uses less digits than its factorization.

9991377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33661 (or 33655 counting only the distinct ones).

The product of its digits is 107163, while the sum is 45.

The square root of 9991377 is about 3160.9139501100. The cubic root of 9991377 is about 215.3815255607.

The spelling of 9991377 in words is "nine million, nine hundred ninety-one thousand, three hundred seventy-seven".