121013609 has 2 divisors, whose sum is σ = 121013610. Its totient is φ = 121013608.

The previous prime is 121013597. The next prime is 121013663. The reversal of 121013609 is 906310121.

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., 66667225 + 54346384 = 8165^2 + 7372^2 .

It is an emirp because it is prime and its reverse (906310121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121013609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121013699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60506804 + 60506805.

It is an arithmetic number, because the mean of its divisors is an integer number (60506805).

Almost surely, 2^121013609 is an apocalyptic number.

It is an amenable number.

121013609 is a deficient number, since it is larger than the sum of its proper divisors (1).

121013609 is an equidigital number, since it uses as much as digits as its factorization.

121013609 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 121013609 is about 11000.6185735167. The cubic root of 121013609 is about 494.6272866887.

The spelling of 121013609 in words is "one hundred twenty-one million, thirteen thousand, six hundred nine".