991229542659 has 12 divisors (see below), whose sum is σ = 1432433113800. Its totient is φ = 660516414624.

The previous prime is 991229542637. The next prime is 991229542663. The reversal of 991229542659 is 956245922199.

991229542659 is a `hidden beast` number, since 9 + 9 + 1 + 2 + 29 + 542 + 65 + 9 = 666.

It is not a de Polignac number, because 991229542659 - 2⁵ = 991229542627 is a prime.

It is a super-3 number, since 3×991229542659³ (a number of 37 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 991229542596 and 991229542605.

It is not an unprimeable number, because it can be changed into a prime (991229549659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25252674 + ... + 25291895.

It is an arithmetic number, because the mean of its divisors is an integer number (119369426150).

Almost surely, 2^991229542659 is an apocalyptic number.

991229542659 is a deficient number, since it is larger than the sum of its proper divisors (441203571141).

991229542659 is a wasteful number, since it uses less digits than its factorization.

991229542659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50546754 (or 50546751 counting only the distinct ones).

The product of its digits is 31492800, while the sum is 63.

The spelling of 991229542659 in words is "nine hundred ninety-one billion, two hundred twenty-nine million, five hundred forty-two thousand, six hundred fifty-nine".