47281621 has 2 divisors, whose sum is σ = 47281622. Its totient is φ = 47281620.

The previous prime is 47281613. The next prime is 47281643. The reversal of 47281621 is 12618274.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39828721 + 7452900 = 6311^2 + 2730^2 .

It is a cyclic number.

It is not a de Polignac number, because 47281621 - 2³ = 47281613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47281681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23640810 + 23640811.

It is an arithmetic number, because the mean of its divisors is an integer number (23640811).

Almost surely, 2^47281621 is an apocalyptic number.

It is an amenable number.

47281621 is a deficient number, since it is larger than the sum of its proper divisors (1).

47281621 is an equidigital number, since it uses as much as digits as its factorization.

47281621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 31.

The square root of 47281621 is about 6876.1632470441. The cubic root of 47281621 is about 361.6019683183.

Adding to 47281621 its reverse (12618274), we get a palindrome (59899895).

The spelling of 47281621 in words is "forty-seven million, two hundred eighty-one thousand, six hundred twenty-one".