56221559 has 4 divisors (see below), whose sum is σ = 56253360. Its totient is φ = 56189760.

The previous prime is 56221553. The next prime is 56221579. The reversal of 56221559 is 95512265.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95512265 = 5 ⋅19102453.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56221559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56221553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13082 + ... + 16839.

It is an arithmetic number, because the mean of its divisors is an integer number (14063340).

Almost surely, 2^56221559 is an apocalyptic number.

56221559 is a deficient number, since it is larger than the sum of its proper divisors (31801).

56221559 is a wasteful number, since it uses less digits than its factorization.

56221559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31800.

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

The square root of 56221559 is about 7498.1036936015. The cubic root of 56221559 is about 383.0901286980.

The spelling of 56221559 in words is "fifty-six million, two hundred twenty-one thousand, five hundred fifty-nine".