561320545 has 8 divisors (see below), whose sum is σ = 690013800. Its totient is φ = 438103680.

The previous prime is 561320527. The next prime is 561320593. The reversal of 561320545 is 545023165.

It can be written as a sum of positive squares in 4 ways, for example, as 1382976 + 559937569 = 1176^2 + 23663^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 561320545 - 2⁹ = 561320033 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1368870 + ... + 1369279.

It is an arithmetic number, because the mean of its divisors is an integer number (86251725).

Almost surely, 2^561320545 is an apocalyptic number.

It is an amenable number.

561320545 is a deficient number, since it is larger than the sum of its proper divisors (128693255).

561320545 is a wasteful number, since it uses less digits than its factorization.

561320545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2738195.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 561320545 is about 23692.2043085906. The cubic root of 561320545 is about 824.9044492950.

The spelling of 561320545 in words is "five hundred sixty-one million, three hundred twenty thousand, five hundred forty-five".