47271821 has 2 divisors, whose sum is σ = 47271822. Its totient is φ = 47271820.

The previous prime is 47271799. The next prime is 47271839. The reversal of 47271821 is 12817274.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25050025 + 22221796 = 5005^2 + 4714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47271821 is a prime.

It is a Sophie Germain prime.

It is a Chen 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 (47271841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23635910 + 23635911.

It is an arithmetic number, because the mean of its divisors is an integer number (23635911).

Almost surely, 2^47271821 is an apocalyptic number.

It is an amenable number.

47271821 is a deficient number, since it is larger than the sum of its proper divisors (1).

47271821 is an equidigital number, since it uses as much as digits as its factorization.

47271821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6272, while the sum is 32.

The square root of 47271821 is about 6875.4506034150. The cubic root of 47271821 is about 361.5769836691.

The spelling of 47271821 in words is "forty-seven million, two hundred seventy-one thousand, eight hundred twenty-one".