991363626 has 48 divisors (see below), whose sum is σ = 2358222048. Its totient is φ = 298490400.

The previous prime is 991363561. The next prime is 991363631. The reversal of 991363626 is 626363199.

It is a happy number.

991363626 is a `hidden beast` number, since 9 + 9 + 1 + 3 + 636 + 2 + 6 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 15141 + ... + 47031.

It is an arithmetic number, because the mean of its divisors is an integer number (49129626).

Almost surely, 2^991363626 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991363626, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1179111024).

991363626 is an abundant number, since it is smaller than the sum of its proper divisors (1366858422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

991363626 is a wasteful number, since it uses less digits than its factorization.

991363626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32067 (or 32064 counting only the distinct ones).

The product of its digits is 314928, while the sum is 45.

The square root of 991363626 is about 31485.9274279796. The cubic root of 991363626 is about 997.1128812337.

The spelling of 991363626 in words is "nine hundred ninety-one million, three hundred sixty-three thousand, six hundred twenty-six".