47785121 has 2 divisors, whose sum is σ = 47785122. Its totient is φ = 47785120.

The previous prime is 47785091. The next prime is 47785123. The reversal of 47785121 is 12158774.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33640000 + 14145121 = 5800^2 + 3761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47785121 is a prime.

Together with 47785123, 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 (47785123) 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, 23892560 + 23892561.

It is an arithmetic number, because the mean of its divisors is an integer number (23892561).

Almost surely, 2^47785121 is an apocalyptic number.

It is an amenable number.

47785121 is a deficient number, since it is larger than the sum of its proper divisors (1).

47785121 is an equidigital number, since it uses as much as digits as its factorization.

47785121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15680, while the sum is 35.

The square root of 47785121 is about 6912.6782797986. The cubic root of 47785121 is about 362.8810002869.

The spelling of 47785121 in words is "forty-seven million, seven hundred eighty-five thousand, one hundred twenty-one".