121313009 has 2 divisors, whose sum is σ = 121313010. Its totient is φ = 121313008.

The previous prime is 121312999. The next prime is 121313011. The reversal of 121313009 is 900313121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85969984 + 35343025 = 9272^2 + 5945^2 .

It is a cyclic number.

It is not a de Polignac number, because 121313009 - 2⁴ = 121312993 is a prime.

Together with 121313011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121313029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60656504 + 60656505.

It is an arithmetic number, because the mean of its divisors is an integer number (60656505).

Almost surely, 2^121313009 is an apocalyptic number.

It is an amenable number.

121313009 is a deficient number, since it is larger than the sum of its proper divisors (1).

121313009 is an equidigital number, since it uses as much as digits as its factorization.

121313009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 121313009 is about 11014.2184924760. The cubic root of 121313009 is about 495.0348701756.

The spelling of 121313009 in words is "one hundred twenty-one million, three hundred thirteen thousand, nine".