618688121 has 2 divisors, whose sum is σ = 618688122. Its totient is φ = 618688120.

The previous prime is 618688099. The next prime is 618688129. The reversal of 618688121 is 121886816.

618688121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 549199225 + 69488896 = 23435^2 + 8336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-618688121 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (618688129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309344060 + 309344061.

It is an arithmetic number, because the mean of its divisors is an integer number (309344061).

Almost surely, 2^618688121 is an apocalyptic number.

It is an amenable number.

618688121 is a deficient number, since it is larger than the sum of its proper divisors (1).

618688121 is an equidigital number, since it uses as much as digits as its factorization.

618688121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 41.

The square root of 618688121 is about 24873.4420818672. The cubic root of 618688121 is about 852.1000533641.

The spelling of 618688121 in words is "six hundred eighteen million, six hundred eighty-eight thousand, one hundred twenty-one".