56789561 has 4 divisors (see below), whose sum is σ = 58324452. Its totient is φ = 55254672.

The previous prime is 56789549. The next prime is 56789567. The reversal of 56789561 is 16598765.

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 54479161 + 2310400 = 7381^2 + 1520^2 .

It is a cyclic number.

It is not a de Polignac number, because 56789561 - 2⁶ = 56789497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56789567) 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, 767390 + ... + 767463.

It is an arithmetic number, because the mean of its divisors is an integer number (14581113).

Almost surely, 2^56789561 is an apocalyptic number.

It is an amenable number.

56789561 is a deficient number, since it is larger than the sum of its proper divisors (1534891).

56789561 is a wasteful number, since it uses less digits than its factorization.

56789561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534890.

The product of its digits is 453600, while the sum is 47.

The square root of 56789561 is about 7535.8848850019. The cubic root of 56789561 is about 384.3759181330.

The spelling of 56789561 in words is "fifty-six million, seven hundred eighty-nine thousand, five hundred sixty-one".