809145992 has 36 divisors (see below), whose sum is σ = 1548085695. Its totient is φ = 396487168.

The previous prime is 809145983. The next prime is 809146057. The reversal of 809145992 is 299541908.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 5 ways, for example, as 31516996 + 777628996 = 5614^2 + 27886^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=20114.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7160528 + ... + 7160640.

Almost surely, 2^809145992 is an apocalyptic number.

It is an amenable number.

809145992 is a deficient number, since it is larger than the sum of its proper divisors (738939703).

809145992 is an equidigital number, since it uses as much as digits as its factorization.

809145992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410 (or 204 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 47.

The square root of 809145992 is about 28445.4915935724. The cubic root of 809145992 is about 931.8420314706.

The spelling of 809145992 in words is "eight hundred nine million, one hundred forty-five thousand, nine hundred ninety-two".