47775977 has 2 divisors, whose sum is σ = 47775978. Its totient is φ = 47775976.

The previous prime is 47775943. The next prime is 47775979. The reversal of 47775977 is 77957774.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47596201 + 179776 = 6899^2 + 424^2 .

It is a cyclic number.

It is not a de Polignac number, because 47775977 - 2⁶ = 47775913 is a prime.

Together with 47775979, 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 (47775979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23887988 + 23887989.

It is an arithmetic number, because the mean of its divisors is an integer number (23887989).

Almost surely, 2^47775977 is an apocalyptic number.

It is an amenable number.

47775977 is a deficient number, since it is larger than the sum of its proper divisors (1).

47775977 is an equidigital number, since it uses as much as digits as its factorization.

47775977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3025260, while the sum is 53.

The square root of 47775977 is about 6912.0168547248. The cubic root of 47775977 is about 362.8578522479.

The spelling of 47775977 in words is "forty-seven million, seven hundred seventy-five thousand, nine hundred seventy-seven".