121638029 has 2 divisors, whose sum is σ = 121638030. Its totient is φ = 121638028.

The previous prime is 121637993. The next prime is 121638047. The reversal of 121638029 is 920836121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65237929 + 56400100 = 8077^2 + 7510^2 .

It is a cyclic number.

It is not a de Polignac number, because 121638029 - 2⁸ = 121637773 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121637986 and 121638004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121638929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60819014 + 60819015.

It is an arithmetic number, because the mean of its divisors is an integer number (60819015).

Almost surely, 2^121638029 is an apocalyptic number.

It is an amenable number.

121638029 is a deficient number, since it is larger than the sum of its proper divisors (1).

121638029 is an equidigital number, since it uses as much as digits as its factorization.

121638029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 121638029 is about 11028.9631878976. The cubic root of 121638029 is about 495.4765726169.

The spelling of 121638029 in words is "one hundred twenty-one million, six hundred thirty-eight thousand, twenty-nine".