121965709 has 2 divisors, whose sum is σ = 121965710. Its totient is φ = 121965708.

The previous prime is 121965703. The next prime is 121965713. The reversal of 121965709 is 907569121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64160100 + 57805609 = 8010^2 + 7603^2 .

It is a cyclic number.

It is not a de Polignac number, because 121965709 - 2⁷ = 121965581 is a prime.

It is a nialpdrome in base 3.

It is a zygodrome in base 3.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121965703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60982854 + 60982855.

It is an arithmetic number, because the mean of its divisors is an integer number (60982855).

Almost surely, 2^121965709 is an apocalyptic number.

It is an amenable number.

121965709 is a deficient number, since it is larger than the sum of its proper divisors (1).

121965709 is an equidigital number, since it uses as much as digits as its factorization.

121965709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 40.

The square root of 121965709 is about 11043.8086274618. The cubic root of 121965709 is about 495.9210942053.

The spelling of 121965709 in words is "one hundred twenty-one million, nine hundred sixty-five thousand, seven hundred nine".