9991629 has 6 divisors (see below), whose sum is σ = 14432366. Its totient is φ = 6661080.

The previous prime is 9991603. The next prime is 9991649. The reversal of 9991629 is 9261999.

It is a happy number.

9991629 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 8037225 + 1954404 = 2835^2 + 1398^2 .

It is not a de Polignac number, because 9991629 - 2¹² = 9987533 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 (9991649) 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 5 ways as a sum of consecutive naturals, for example, 555082 + ... + 555099.

Almost surely, 2^9991629 is an apocalyptic number.

It is an amenable number.

9991629 is a deficient number, since it is larger than the sum of its proper divisors (4440737).

9991629 is a wasteful number, since it uses less digits than its factorization.

9991629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110187 (or 1110184 counting only the distinct ones).

The product of its digits is 78732, while the sum is 45.

The square root of 9991629 is about 3160.9538117473. The cubic root of 9991629 is about 215.3833363117.

It can be divided in two parts, 999 and 1629, that added together give a triangular number (2628 = T₇₂).

The spelling of 9991629 in words is "nine million, nine hundred ninety-one thousand, six hundred twenty-nine".