9991838152 has 8 divisors (see below), whose sum is σ = 18734696550. Its totient is φ = 4995919072.

The previous prime is 9991838137. The next prime is 9991838159. The reversal of 9991838152 is 2518381999.

9991838152 is digitally balanced in base 2, 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., 6053773636 + 3938064516 = 77806^2 + 62754^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 9991838093 and 9991838102.

It is not an unprimeable number, because it can be changed into a prime (9991838159) 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 as a sum of consecutive naturals, namely, 624489877 + ... + 624489892.

Almost surely, 2^9991838152 is an apocalyptic number.

It is an amenable number.

9991838152 is a deficient number, since it is larger than the sum of its proper divisors (8742858398).

9991838152 is a wasteful number, since it uses less digits than its factorization.

9991838152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248979775 (or 1248979771 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 55.

The square root of 9991838152 is about 99959.1824296297. The cubic root of 9991838152 is about 2153.8483915448.

The spelling of 9991838152 in words is "nine billion, nine hundred ninety-one million, eight hundred thirty-eight thousand, one hundred fifty-two".