47811977 has 2 divisors, whose sum is σ = 47811978. Its totient is φ = 47811976.

The previous prime is 47811971. The next prime is 47811991. The reversal of 47811977 is 77911874.

It is a happy number.

47811977 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., 24810361 + 23001616 = 4981^2 + 4796^2 .

It is a cyclic number.

It is not a de Polignac number, because 47811977 - 2⁸ = 47811721 is a prime.

It is not a weakly prime, because it can be changed into another prime (47811971) 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, 23905988 + 23905989.

It is an arithmetic number, because the mean of its divisors is an integer number (23905989).

Almost surely, 2^47811977 is an apocalyptic number.

It is an amenable number.

47811977 is a deficient number, since it is larger than the sum of its proper divisors (1).

47811977 is an equidigital number, since it uses as much as digits as its factorization.

47811977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 98784, while the sum is 44.

The square root of 47811977 is about 6914.6205246564. The cubic root of 47811977 is about 362.9489691916.

The spelling of 47811977 in words is "forty-seven million, eight hundred eleven thousand, nine hundred seventy-seven".