47809477 has 2 divisors, whose sum is σ = 47809478. Its totient is φ = 47809476.

The previous prime is 47809451. The next prime is 47809493. The reversal of 47809477 is 77490874.

47809477 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., 41654116 + 6155361 = 6454^2 + 2481^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47809477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47809427) 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, 23904738 + 23904739.

It is an arithmetic number, because the mean of its divisors is an integer number (23904739).

Almost surely, 2^47809477 is an apocalyptic number.

It is an amenable number.

47809477 is a deficient number, since it is larger than the sum of its proper divisors (1).

47809477 is an equidigital number, since it uses as much as digits as its factorization.

47809477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 395136, while the sum is 46.

The square root of 47809477 is about 6914.4397459230. The cubic root of 47809477 is about 362.9426431042.

The spelling of 47809477 in words is "forty-seven million, eight hundred nine thousand, four hundred seventy-seven".