47789909 has 2 divisors, whose sum is σ = 47789910. Its totient is φ = 47789908.

The previous prime is 47789893. The next prime is 47789923. The reversal of 47789909 is 90998774.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47306884 + 483025 = 6878^2 + 695^2 .

It is a cyclic number.

It is not a de Polignac number, because 47789909 - 2⁴ = 47789893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47789939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23894954 + 23894955.

It is an arithmetic number, because the mean of its divisors is an integer number (23894955).

Almost surely, 2^47789909 is an apocalyptic number.

It is an amenable number.

47789909 is a deficient number, since it is larger than the sum of its proper divisors (1).

47789909 is an equidigital number, since it uses as much as digits as its factorization.

47789909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1143072, while the sum is 53.

The square root of 47789909 is about 6913.0245913059. The cubic root of 47789909 is about 362.8931199326.

The spelling of 47789909 in words is "forty-seven million, seven hundred eighty-nine thousand, nine hundred nine".