47421581 has 2 divisors, whose sum is σ = 47421582. Its totient is φ = 47421580.

The previous prime is 47421571. The next prime is 47421589. The reversal of 47421581 is 18512474.

It is a happy number.

47421581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45292900 + 2128681 = 6730^2 + 1459^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47421581 is a prime.

It is a super-2 number, since 2×47421581² = 4497612689079122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47421589) 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, 23710790 + 23710791.

It is an arithmetic number, because the mean of its divisors is an integer number (23710791).

Almost surely, 2^47421581 is an apocalyptic number.

It is an amenable number.

47421581 is a deficient number, since it is larger than the sum of its proper divisors (1).

47421581 is an equidigital number, since it uses as much as digits as its factorization.

47421581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 32.

The square root of 47421581 is about 6886.3329138229. The cubic root of 47421581 is about 361.9584137692.

The spelling of 47421581 in words is "forty-seven million, four hundred twenty-one thousand, five hundred eighty-one".