56661947 has 4 divisors (see below), whose sum is σ = 56793240. Its totient is φ = 56530656.

The previous prime is 56661937. The next prime is 56661953. The reversal of 56661947 is 74916665.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56661947 - 2⁶ = 56661883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56661898 and 56661907.

It is not an unprimeable number, because it can be changed into a prime (56661937) 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, 64997 + ... + 65862.

It is an arithmetic number, because the mean of its divisors is an integer number (14198310).

Almost surely, 2^56661947 is an apocalyptic number.

56661947 is a deficient number, since it is larger than the sum of its proper divisors (131293).

56661947 is a wasteful number, since it uses less digits than its factorization.

56661947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131292.

The product of its digits is 272160, while the sum is 44.

The square root of 56661947 is about 7527.4130350340. The cubic root of 56661947 is about 384.0877869136.

The spelling of 56661947 in words is "fifty-six million, six hundred sixty-one thousand, nine hundred forty-seven".