938913121 has 2 divisors, whose sum is σ = 938913122. Its totient is φ = 938913120.

The previous prime is 938913119. The next prime is 938913187. The reversal of 938913121 is 121319839.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 874030096 + 64883025 = 29564^2 + 8055^2 .

It is an emirp because it is prime and its reverse (121319839) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 938913121 - 2¹ = 938913119 is a prime.

Together with 938913119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (938913191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 469456560 + 469456561.

It is an arithmetic number, because the mean of its divisors is an integer number (469456561).

Almost surely, 2^938913121 is an apocalyptic number.

It is an amenable number.

938913121 is a deficient number, since it is larger than the sum of its proper divisors (1).

938913121 is an equidigital number, since it uses as much as digits as its factorization.

938913121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 37.

The square root of 938913121 is about 30641.6892647909. The cubic root of 938913121 is about 979.2084129051.

The spelling of 938913121 in words is "nine hundred thirty-eight million, nine hundred thirteen thousand, one hundred twenty-one".