47291021 has 2 divisors, whose sum is σ = 47291022. Its totient is φ = 47291020.

The previous prime is 47291017. The next prime is 47291029. The reversal of 47291021 is 12019274.

47291021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45414121 + 1876900 = 6739^2 + 1370^2 .

It is a cyclic number.

It is not a de Polignac number, because 47291021 - 2² = 47291017 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 (47291029) 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, 23645510 + 23645511.

It is an arithmetic number, because the mean of its divisors is an integer number (23645511).

Almost surely, 2^47291021 is an apocalyptic number.

It is an amenable number.

47291021 is a deficient number, since it is larger than the sum of its proper divisors (1).

47291021 is an equidigital number, since it uses as much as digits as its factorization.

47291021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 47291021 is about 6876.8467337872. The cubic root of 47291021 is about 361.6259299423.

The spelling of 47291021 in words is "forty-seven million, two hundred ninety-one thousand, twenty-one".