47788121 has 2 divisors, whose sum is σ = 47788122. Its totient is φ = 47788120.

The previous prime is 47788099. The next prime is 47788123. The reversal of 47788121 is 12188774.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41731600 + 6056521 = 6460^2 + 2461^2 .

It is a cyclic number.

It is not a de Polignac number, because 47788121 - 2⁶ = 47788057 is a prime.

Together with 47788123, 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 (47788123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23894060 + 23894061.

It is an arithmetic number, because the mean of its divisors is an integer number (23894061).

Almost surely, 2^47788121 is an apocalyptic number.

It is an amenable number.

47788121 is a deficient number, since it is larger than the sum of its proper divisors (1).

47788121 is an equidigital number, since it uses as much as digits as its factorization.

47788121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25088, while the sum is 38.

The square root of 47788121 is about 6912.8952689882. The cubic root of 47788121 is about 362.8885941446. Note that the first 3 decimals are identical.

The spelling of 47788121 in words is "forty-seven million, seven hundred eighty-eight thousand, one hundred twenty-one".