47277809 has 2 divisors, whose sum is σ = 47277810. Its totient is φ = 47277808.

The previous prime is 47277803. The next prime is 47277827. The reversal of 47277809 is 90877274.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30030400 + 17247409 = 5480^2 + 4153^2 .

It is a cyclic number.

It is not a de Polignac number, because 47277809 - 2⁸ = 47277553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 47277809.

It is not a weakly prime, because it can be changed into another prime (47277803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23638904 + 23638905.

It is an arithmetic number, because the mean of its divisors is an integer number (23638905).

Almost surely, 2^47277809 is an apocalyptic number.

It is an amenable number.

47277809 is a deficient number, since it is larger than the sum of its proper divisors (1).

47277809 is an equidigital number, since it uses as much as digits as its factorization.

47277809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 197568, while the sum is 44.

The square root of 47277809 is about 6875.8860519936. The cubic root of 47277809 is about 361.5922502100.

The spelling of 47277809 in words is "forty-seven million, two hundred seventy-seven thousand, eight hundred nine".