561520145 has 4 divisors (see below), whose sum is σ = 673824180. Its totient is φ = 449216112.

The previous prime is 561520121. The next prime is 561520153. The reversal of 561520145 is 541025165.

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 219750976 + 341769169 = 14824^2 + 18487^2 .

It is a cyclic number.

It is not a de Polignac number, because 561520145 - 2¹² = 561516049 is a prime.

It is a Curzon number.

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, 56152010 + ... + 56152019.

It is an arithmetic number, because the mean of its divisors is an integer number (168456045).

Almost surely, 2^561520145 is an apocalyptic number.

It is an amenable number.

561520145 is a deficient number, since it is larger than the sum of its proper divisors (112304035).

561520145 is a wasteful number, since it uses less digits than its factorization.

561520145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112304034.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 561520145 is about 23696.4162902326. The cubic root of 561520145 is about 825.0022136457.

The spelling of 561520145 in words is "five hundred sixty-one million, five hundred twenty thousand, one hundred forty-five".