47798921 has 2 divisors, whose sum is σ = 47798922. Its totient is φ = 47798920.

The previous prime is 47798911. The next prime is 47798923. The reversal of 47798921 is 12989774.

47798921 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., 37945600 + 9853321 = 6160^2 + 3139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47798921 is a prime.

Together with 47798923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (47798923) 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, 23899460 + 23899461.

It is an arithmetic number, because the mean of its divisors is an integer number (23899461).

Almost surely, 2^47798921 is an apocalyptic number.

It is an amenable number.

47798921 is a deficient number, since it is larger than the sum of its proper divisors (1).

47798921 is an equidigital number, since it uses as much as digits as its factorization.

47798921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 47.

The square root of 47798921 is about 6913.6763736814. The cubic root of 47798921 is about 362.9159294009.

The spelling of 47798921 in words is "forty-seven million, seven hundred ninety-eight thousand, nine hundred twenty-one".