9991562 has 16 divisors (see below), whose sum is σ = 17227392. Its totient is φ = 4257360.

The previous prime is 9991559. The next prime is 9991567. The reversal of 9991562 is 2651999.

It is a super-2 number, since 2×9991562² = 199662622399688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9991567) 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 7 ways as a sum of consecutive naturals, for example, 563 + ... + 4505.

It is an arithmetic number, because the mean of its divisors is an integer number (1076712).

Almost surely, 2^9991562 is an apocalyptic number.

9991562 is a deficient number, since it is larger than the sum of its proper divisors (7235830).

9991562 is a wasteful number, since it uses less digits than its factorization.

9991562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4133.

The product of its digits is 43740, while the sum is 41.

The square root of 9991562 is about 3160.9432136627. The cubic root of 9991562 is about 215.3828548849.

The spelling of 9991562 in words is "nine million, nine hundred ninety-one thousand, five hundred sixty-two".