8450812561 has 4 divisors (see below), whose sum is σ = 8451756324. Its totient is φ = 8449868800.

The previous prime is 8450812547. The next prime is 8450812613. The reversal of 8450812561 is 1652180548.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6878214225 + 1572598336 = 82935^2 + 39656^2 .

It is a cyclic number.

It is not a de Polignac number, because 8450812561 - 2⁹ = 8450812049 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8450812361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 458320 + ... + 476401.

It is an arithmetic number, because the mean of its divisors is an integer number (2112939081).

Almost surely, 2^8450812561 is an apocalyptic number.

It is an amenable number.

8450812561 is a deficient number, since it is larger than the sum of its proper divisors (943763).

8450812561 is an equidigital number, since it uses as much as digits as its factorization.

8450812561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943762.

The product of its (nonzero) digits is 76800, while the sum is 40.

The square root of 8450812561 is about 91928.3011971830. The cubic root of 8450812561 is about 2036.8833416869.

The spelling of 8450812561 in words is "eight billion, four hundred fifty million, eight hundred twelve thousand, five hundred sixty-one".