47820181 has 2 divisors, whose sum is σ = 47820182. Its totient is φ = 47820180.

The previous prime is 47820163. The next prime is 47820191. The reversal of 47820181 is 18102874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40119556 + 7700625 = 6334^2 + 2775^2 .

It is a cyclic number.

It is not a de Polignac number, because 47820181 - 2⁷ = 47820053 is a prime.

It is a super-2 number, since 2×47820181² = 4573539421745522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47820191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23910090 + 23910091.

It is an arithmetic number, because the mean of its divisors is an integer number (23910091).

Almost surely, 2^47820181 is an apocalyptic number.

It is an amenable number.

47820181 is a deficient number, since it is larger than the sum of its proper divisors (1).

47820181 is an equidigital number, since it uses as much as digits as its factorization.

47820181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 47820181 is about 6915.2137349470. The cubic root of 47820181 is about 362.9697273310.

The spelling of 47820181 in words is "forty-seven million, eight hundred twenty thousand, one hundred eighty-one".