47447681 has 4 divisors (see below), whose sum is σ = 47564100. Its totient is φ = 47331264.

The previous prime is 47447669. The next prime is 47447711. The reversal of 47447681 is 18674474.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23280625 + 24167056 = 4825^2 + 4916^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47447681 is a prime.

It is a super-2 number, since 2×47447681² = 4502564864555522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (47447381) 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, 57596 + ... + 58413.

It is an arithmetic number, because the mean of its divisors is an integer number (11891025).

Almost surely, 2^47447681 is an apocalyptic number.

It is an amenable number.

47447681 is a deficient number, since it is larger than the sum of its proper divisors (116419).

47447681 is a wasteful number, since it uses less digits than its factorization.

47447681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116418.

The product of its digits is 150528, while the sum is 41.

The square root of 47447681 is about 6888.2277111025. The cubic root of 47447681 is about 362.0248067613.

The spelling of 47447681 in words is "forty-seven million, four hundred forty-seven thousand, six hundred eighty-one".