991525632 has 72 divisors (see below), whose sum is σ = 2703353520. Its totient is φ = 322437120.

The previous prime is 991525627. The next prime is 991525637. The reversal of 991525632 is 236525199.

It is an interprime number because it is at equal distance from previous prime (991525627) and next prime (991525637).

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15744 + ... + 47232.

Almost surely, 2^991525632 is an apocalyptic number.

It is a pronic number, being equal to 31488×31489.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991525632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1351676760).

991525632 is an abundant number, since it is smaller than the sum of its proper divisors (1711827888).

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

991525632 is a wasteful number, since it uses less digits than its factorization.

991525632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31549 (or 31535 counting only the distinct ones).

The product of its digits is 145800, while the sum is 42.

The square root of 991525632 is about 31488.4999960303. The cubic root of 991525632 is about 997.1671934513.

The spelling of 991525632 in words is "nine hundred ninety-one million, five hundred twenty-five thousand, six hundred thirty-two".