47985281 has 2 divisors, whose sum is σ = 47985282. Its totient is φ = 47985280.

The previous prime is 47985277. The next prime is 47985283. The reversal of 47985281 is 18258974.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40195600 + 7789681 = 6340^2 + 2791^2 .

It is a cyclic number.

It is not a de Polignac number, because 47985281 - 2² = 47985277 is a prime.

It is a super-2 number, since 2×47985281² = 4605174385297922, which contains 22 as substring.

Together with 47985283, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (47985283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23992640 + 23992641.

It is an arithmetic number, because the mean of its divisors is an integer number (23992641).

Almost surely, 2^47985281 is an apocalyptic number.

It is an amenable number.

47985281 is a deficient number, since it is larger than the sum of its proper divisors (1).

47985281 is an equidigital number, since it uses as much as digits as its factorization.

47985281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 44.

The square root of 47985281 is about 6927.1408965027. The cubic root of 47985281 is about 363.3869672715.

The spelling of 47985281 in words is "forty-seven million, nine hundred eighty-five thousand, two hundred eighty-one".