991452808 has 8 divisors (see below), whose sum is σ = 1858974030. Its totient is φ = 495726400.

The previous prime is 991452799. The next prime is 991452809. The reversal of 991452808 is 808254199.

It can be written as a sum of positive squares in only one way, i.e., 964847844 + 26604964 = 31062^2 + 5158^2 .

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

It is not an unprimeable number, because it can be changed into a prime (991452809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61965793 + ... + 61965808.

Almost surely, 2^991452808 is an apocalyptic number.

It is an amenable number.

991452808 is a deficient number, since it is larger than the sum of its proper divisors (867521222).

991452808 is a wasteful number, since it uses less digits than its factorization.

991452808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123931607 (or 123931603 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 46.

The square root of 991452808 is about 31487.3436161261. The cubic root of 991452808 is about 997.1427800694.

The spelling of 991452808 in words is "nine hundred ninety-one million, four hundred fifty-two thousand, eight hundred eight".