47947681 has 4 divisors (see below), whose sum is σ = 48081600. Its totient is φ = 47813764.

The previous prime is 47947631. The next prime is 47947693. The reversal of 47947681 is 18674974.

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 a cyclic number.

It is not a de Polignac number, because 47947681 - 2¹⁵ = 47914913 is a prime.

It is a super-2 number, since 2×47947681² = 4597960226555522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47947631) 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, 66421 + ... + 67138.

It is an arithmetic number, because the mean of its divisors is an integer number (12020400).

Almost surely, 2^47947681 is an apocalyptic number.

It is an amenable number.

47947681 is a deficient number, since it is larger than the sum of its proper divisors (133919).

47947681 is a wasteful number, since it uses less digits than its factorization.

47947681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133918.

The product of its digits is 338688, while the sum is 46.

The square root of 47947681 is about 6924.4264022372. The cubic root of 47947681 is about 363.2920289905.

The spelling of 47947681 in words is "forty-seven million, nine hundred forty-seven thousand, six hundred eighty-one".