56565161 has 4 divisors (see below), whose sum is σ = 56688324. Its totient is φ = 56442000.

The previous prime is 56565133. The next prime is 56565169. The reversal of 56565161 is 16156565.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16156565 = 5 ⋅3231313.

It can be written as a sum of positive squares in 2 ways, for example, as 40081561 + 16483600 = 6331^2 + 4060^2 .

It is a cyclic number.

It is not a de Polignac number, because 56565161 - 2⁶ = 56565097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56565169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60890 + ... + 61811.

It is an arithmetic number, because the mean of its divisors is an integer number (14172081).

Almost surely, 2^56565161 is an apocalyptic number.

It is an amenable number.

56565161 is a deficient number, since it is larger than the sum of its proper divisors (123163).

56565161 is a wasteful number, since it uses less digits than its factorization.

56565161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123162.

The product of its digits is 27000, while the sum is 35.

The square root of 56565161 is about 7520.9813854310. The cubic root of 56565161 is about 383.8689715897.

The spelling of 56565161 in words is "fifty-six million, five hundred sixty-five thousand, one hundred sixty-one".