805561245 has 18 divisors (see below), whose sum is σ = 1396636254. Its totient is φ = 429531120.

The previous prime is 805561241. The next prime is 805561261. The reversal of 805561245 is 542165508.

805561245 is a `hidden beast` number, since 80 + 556 + 1 + 24 + 5 = 666.

It can be written as a sum of positive squares in only one way, i.e., 644448996 + 161112249 = 25386^2 + 12693^2 .

It is not a de Polignac number, because 805561245 - 2² = 805561241 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805561241) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 188280 + ... + 192510.

It is an arithmetic number, because the mean of its divisors is an integer number (77590903).

Almost surely, 2^805561245 is an apocalyptic number.

It is an amenable number.

805561245 is a deficient number, since it is larger than the sum of its proper divisors (591075009).

805561245 is an frugal number, since it uses more digits than its factorization.

805561245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8473 (or 4239 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The square root of 805561245 is about 28382.4108384048. The cubic root of 805561245 is about 930.4638858134.

The spelling of 805561245 in words is "eight hundred five million, five hundred sixty-one thousand, two hundred forty-five".