991534900 has 18 divisors (see below), whose sum is σ = 2151630950. Its totient is φ = 396613920.

The previous prime is 991534891. The next prime is 991534903. The reversal of 991534900 is 9435199.

It can be written as a sum of positive squares in 3 ways, for example, as 128232976 + 863301924 = 11324^2 + 29382^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991534903) 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 5 ways as a sum of consecutive naturals, for example, 4957575 + ... + 4957774.

Almost surely, 2^991534900 is an apocalyptic number.

It is an amenable number.

991534900 is an abundant number, since it is smaller than the sum of its proper divisors (1160096050).

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

991534900 is a wasteful number, since it uses less digits than its factorization.

991534900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9915363 (or 9915356 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 991534900 is about 31488.6471605244. The cubic root of 991534900 is about 997.1703003526.

The spelling of 991534900 in words is "nine hundred ninety-one million, five hundred thirty-four thousand, nine hundred".