47646561 has 4 divisors (see below), whose sum is σ = 63528752. Its totient is φ = 31764372.

The previous prime is 47646553. The next prime is 47646569. The reversal of 47646561 is 16564674.

47646561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (47646553) and next prime (47646569).

It is not a de Polignac number, because 47646561 - 2³ = 47646553 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 (47646569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7941091 + ... + 7941096.

It is an arithmetic number, because the mean of its divisors is an integer number (15882188).

Almost surely, 2^47646561 is an apocalyptic number.

It is an amenable number.

47646561 is a deficient number, since it is larger than the sum of its proper divisors (15882191).

47646561 is a wasteful number, since it uses less digits than its factorization.

47646561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15882190.

The product of its digits is 120960, while the sum is 39.

The square root of 47646561 is about 6902.6488393949. The cubic root of 47646561 is about 362.5299184185.

It can be divided in two parts, 4764 and 6561, that added together give a triangular number (11325 = T₁₅₀).

The spelling of 47646561 in words is "forty-seven million, six hundred forty-six thousand, five hundred sixty-one".