121407709 has 2 divisors, whose sum is σ = 121407710. Its totient is φ = 121407708.

The previous prime is 121407673. The next prime is 121407857. The reversal of 121407709 is 907704121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118156900 + 3250809 = 10870^2 + 1803^2 .

It is a cyclic number.

It is not a de Polignac number, because 121407709 - 2¹⁹ = 120883421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121407509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60703854 + 60703855.

It is an arithmetic number, because the mean of its divisors is an integer number (60703855).

Almost surely, 2^121407709 is an apocalyptic number.

It is an amenable number.

121407709 is a deficient number, since it is larger than the sum of its proper divisors (1).

121407709 is an equidigital number, since it uses as much as digits as its factorization.

121407709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 121407709 is about 11018.5166424524. The cubic root of 121407709 is about 495.1636489146.

The spelling of 121407709 in words is "one hundred twenty-one million, four hundred seven thousand, seven hundred nine".