47827981 has 2 divisors, whose sum is σ = 47827982. Its totient is φ = 47827980.

The previous prime is 47827979. The next prime is 47828029. The reversal of 47827981 is 18972874.

47827981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35640900 + 12187081 = 5970^2 + 3491^2 .

It is a cyclic number.

It is not a de Polignac number, because 47827981 - 2¹ = 47827979 is a prime.

It is a super-2 number, since 2×47827981² = 4575031533072722, which contains 22 as substring.

Together with 47827979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47827951) 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 as a sum of consecutive naturals, namely, 23913990 + 23913991.

It is an arithmetic number, because the mean of its divisors is an integer number (23913991).

Almost surely, 2^47827981 is an apocalyptic number.

It is an amenable number.

47827981 is a deficient number, since it is larger than the sum of its proper divisors (1).

47827981 is an equidigital number, since it uses as much as digits as its factorization.

47827981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 46.

The square root of 47827981 is about 6915.7776858427. Note that the first 3 decimals coincide. The cubic root of 47827981 is about 362.9894610494.

The spelling of 47827981 in words is "forty-seven million, eight hundred twenty-seven thousand, nine hundred eighty-one".