47248921 has 2 divisors, whose sum is σ = 47248922. Its totient is φ = 47248920.

The previous prime is 47248919. The next prime is 47248931. The reversal of 47248921 is 12984274.

47248921 = 4860² + 4861².

47248921 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., 23629321 + 23619600 = 4861^2 + 4860^2 .

It is a cyclic number.

It is not a de Polignac number, because 47248921 - 2¹ = 47248919 is a prime.

Together with 47248919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (47248931) 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, 23624460 + 23624461.

It is an arithmetic number, because the mean of its divisors is an integer number (23624461).

Almost surely, 2^47248921 is an apocalyptic number.

47248921 is the 4861-st centered square number.

It is an amenable number.

47248921 is a deficient number, since it is larger than the sum of its proper divisors (1).

47248921 is an equidigital number, since it uses as much as digits as its factorization.

47248921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 37.

The square root of 47248921 is about 6873.7850562845. The cubic root of 47248921 is about 361.5185877074.

The spelling of 47248921 in words is "forty-seven million, two hundred forty-eight thousand, nine hundred twenty-one".