47779021 has 2 divisors, whose sum is σ = 47779022. Its totient is φ = 47779020.

The previous prime is 47779003. The next prime is 47779057. The reversal of 47779021 is 12097774.

47779021 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., 46049796 + 1729225 = 6786^2 + 1315^2 .

It is a cyclic number.

It is not a de Polignac number, because 47779021 - 2⁹ = 47778509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47779421) 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, 23889510 + 23889511.

It is an arithmetic number, because the mean of its divisors is an integer number (23889511).

Almost surely, 2^47779021 is an apocalyptic number.

It is an amenable number.

47779021 is a deficient number, since it is larger than the sum of its proper divisors (1).

47779021 is an equidigital number, since it uses as much as digits as its factorization.

47779021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24696, while the sum is 37.

The square root of 47779021 is about 6912.2370474399. The cubic root of 47779021 is about 362.8655584628.

The spelling of 47779021 in words is "forty-seven million, seven hundred seventy-nine thousand, twenty-one".