121016309 has 2 divisors, whose sum is σ = 121016310. Its totient is φ = 121016308.

The previous prime is 121016299. The next prime is 121016321. The reversal of 121016309 is 903610121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117115684 + 3900625 = 10822^2 + 1975^2 .

It is a cyclic number.

It is not a de Polignac number, because 121016309 - 2⁴ = 121016293 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121016369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60508154 + 60508155.

It is an arithmetic number, because the mean of its divisors is an integer number (60508155).

Almost surely, 2^121016309 is an apocalyptic number.

It is an amenable number.

121016309 is a deficient number, since it is larger than the sum of its proper divisors (1).

121016309 is an equidigital number, since it uses as much as digits as its factorization.

121016309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 121016309 is about 11000.7412932038. The cubic root of 121016309 is about 494.6309652935.

The spelling of 121016309 in words is "one hundred twenty-one million, sixteen thousand, three hundred nine".