47581643 has 4 divisors (see below), whose sum is σ = 50085960. Its totient is φ = 45077328.

The previous prime is 47581637. The next prime is 47581649. The reversal of 47581643 is 34618574.

47581643 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 an emirpimes, since its reverse is a distinct semiprime: 34618574 = 2 ⋅17309287.

It is an interprime number because it is at equal distance from previous prime (47581637) and next prime (47581649).

It is a cyclic number.

It is not a de Polignac number, because 47581643 - 2⁴ = 47581627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 47581597 and 47581606.

It is not an unprimeable number, because it can be changed into a prime (47581649) 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, 1252130 + ... + 1252167.

It is an arithmetic number, because the mean of its divisors is an integer number (12521490).

Almost surely, 2^47581643 is an apocalyptic number.

47581643 is a deficient number, since it is larger than the sum of its proper divisors (2504317).

47581643 is a wasteful number, since it uses less digits than its factorization.

47581643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2504316.

The product of its digits is 80640, while the sum is 38.

The square root of 47581643 is about 6897.9448388632. The cubic root of 47581643 is about 362.3651956945.

The spelling of 47581643 in words is "forty-seven million, five hundred eighty-one thousand, six hundred forty-three".