121116409 has 2 divisors, whose sum is σ = 121116410. Its totient is φ = 121116408.

The previous prime is 121116397. The next prime is 121116427. The reversal of 121116409 is 904611121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119683600 + 1432809 = 10940^2 + 1197^2 .

It is a cyclic number.

It is not a de Polignac number, because 121116409 - 2⁵ = 121116377 is a prime.

It is not a weakly prime, because it can be changed into another prime (121111409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60558204 + 60558205.

It is an arithmetic number, because the mean of its divisors is an integer number (60558205).

Almost surely, 2^121116409 is an apocalyptic number.

It is an amenable number.

121116409 is a deficient number, since it is larger than the sum of its proper divisors (1).

121116409 is an equidigital number, since it uses as much as digits as its factorization.

121116409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 121116409 is about 11005.2900461551. The cubic root of 121116409 is about 494.7673075620.

The spelling of 121116409 in words is "one hundred twenty-one million, one hundred sixteen thousand, four hundred nine".