991525633 has 12 divisors (see below), whose sum is σ = 1154091540. Its totient is φ = 849375072.

The previous prime is 991525627. The next prime is 991525637. The reversal of 991525633 is 336525199.

991525633 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 2 ways, for example, as 626601024 + 364924609 = 25032^2 + 19103^2 .

It is not a de Polignac number, because 991525633 - 2¹⁷ = 991394561 is a prime.

It is the 31489-th Hogben number.

It is a self number, because there is not a number n which added to its sum of digits gives 991525633.

It is not an unprimeable number, because it can be changed into a prime (991525637) by changing a digit.

It is a nontrivial repunit in base 31488.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94435 + ... + 104407.

It is an arithmetic number, because the mean of its divisors is an integer number (96174295).

Almost surely, 2^991525633 is an apocalyptic number.

It is an amenable number.

991525633 is a deficient number, since it is larger than the sum of its proper divisors (162565907).

991525633 is a wasteful number, since it uses less digits than its factorization.

991525633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12016 (or 12009 counting only the distinct ones).

The product of its digits is 218700, while the sum is 43.

The square root of 991525633 is about 31488.5000119091. The cubic root of 991525633 is about 997.1671937865.

The spelling of 991525633 in words is "nine hundred ninety-one million, five hundred twenty-five thousand, six hundred thirty-three".