388633121 has 2 divisors, whose sum is σ = 388633122. Its totient is φ = 388633120.

The previous prime is 388633109. The next prime is 388633123. The reversal of 388633121 is 121336883.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 377874721 + 10758400 = 19439^2 + 3280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-388633121 is a prime.

Together with 388633123, 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 (388633123) 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, 194316560 + 194316561.

It is an arithmetic number, because the mean of its divisors is an integer number (194316561).

Almost surely, 2^388633121 is an apocalyptic number.

It is an amenable number.

388633121 is a deficient number, since it is larger than the sum of its proper divisors (1).

388633121 is an equidigital number, since it uses as much as digits as its factorization.

388633121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 35.

The square root of 388633121 is about 19713.7799774675. The cubic root of 388633121 is about 729.7598015019.

The spelling of 388633121 in words is "three hundred eighty-eight million, six hundred thirty-three thousand, one hundred twenty-one".