9190991 has 8 divisors (see below), whose sum is σ = 9433344. Its totient is φ = 8950680.

The previous prime is 9190963. The next prime is 9190997. The reversal of 9190991 is 1990919.

It is a happy number.

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

It is not a de Polignac number, because 9190991 - 2¹⁸ = 8928847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9190997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12956 + ... + 13646.

It is an arithmetic number, because the mean of its divisors is an integer number (1179168).

Almost surely, 2^9190991 is an apocalyptic number.

9190991 is a deficient number, since it is larger than the sum of its proper divisors (242353).

9190991 is a wasteful number, since it uses less digits than its factorization.

9190991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021.

The product of its (nonzero) digits is 6561, while the sum is 38.

The square root of 9190991 is about 3031.6647242068. The cubic root of 9190991 is about 209.4694923897.

The spelling of 9190991 in words is "nine million, one hundred ninety thousand, nine hundred ninety-one".