121232009 has 2 divisors, whose sum is σ = 121232010. Its totient is φ = 121232008.

The previous prime is 121231993. The next prime is 121232021. The reversal of 121232009 is 900232121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64561225 + 56670784 = 8035^2 + 7528^2 .

It is a cyclic number.

It is not a de Polignac number, because 121232009 - 2⁴ = 121231993 is a prime.

It is not a weakly prime, because it can be changed into another prime (121232029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60616004 + 60616005.

It is an arithmetic number, because the mean of its divisors is an integer number (60616005).

Almost surely, 2^121232009 is an apocalyptic number.

It is an amenable number.

121232009 is a deficient number, since it is larger than the sum of its proper divisors (1).

121232009 is an equidigital number, since it uses as much as digits as its factorization.

121232009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 121232009 is about 11010.5408132389. The cubic root of 121232009 is about 494.9246683308.

The spelling of 121232009 in words is "one hundred twenty-one million, two hundred thirty-two thousand, nine".