56061209 has 4 divisors (see below), whose sum is σ = 56279604. Its totient is φ = 55842816.

The previous prime is 56061197. The next prime is 56061211. The reversal of 56061209 is 90216065.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90216065 = 5 ⋅18043213.

It can be written as a sum of positive squares in 2 ways, for example, as 51768025 + 4293184 = 7195^2 + 2072^2 .

It is a cyclic number.

It is not a de Polignac number, because 56061209 - 2⁴ = 56061193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56061409) 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, 108812 + ... + 109325.

It is an arithmetic number, because the mean of its divisors is an integer number (14069901).

Almost surely, 2^56061209 is an apocalyptic number.

It is an amenable number.

56061209 is a deficient number, since it is larger than the sum of its proper divisors (218395).

56061209 is a wasteful number, since it uses less digits than its factorization.

56061209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218394.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 56061209 is about 7487.4033549689. The cubic root of 56061209 is about 382.7255769958.

The spelling of 56061209 in words is "fifty-six million, sixty-one thousand, two hundred nine".