561405545 has 4 divisors (see below), whose sum is σ = 673686660. Its totient is φ = 449124432.

The previous prime is 561405527. The next prime is 561405563. The reversal of 561405545 is 545504165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 545504165 = 5 ⋅109100833.

It is an interprime number because it is at equal distance from previous prime (561405527) and next prime (561405563).

It can be written as a sum of positive squares in 2 ways, for example, as 379587289 + 181818256 = 19483^2 + 13484^2 .

It is a cyclic number.

It is not a de Polignac number, because 561405545 - 2⁸ = 561405289 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56140550 + ... + 56140559.

It is an arithmetic number, because the mean of its divisors is an integer number (168421665).

Almost surely, 2^561405545 is an apocalyptic number.

It is an amenable number.

561405545 is a deficient number, since it is larger than the sum of its proper divisors (112281115).

561405545 is a wasteful number, since it uses less digits than its factorization.

561405545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112281114.

The product of its (nonzero) digits is 60000, while the sum is 35.

The square root of 561405545 is about 23693.9980796825. The cubic root of 561405545 is about 824.9460852431.

The spelling of 561405545 in words is "five hundred sixty-one million, four hundred five thousand, five hundred forty-five".