121272309 has 12 divisors (see below), whose sum is σ = 181659296. Its totient is φ = 80848044.

The previous prime is 121272289. The next prime is 121272311. The reversal of 121272309 is 903272121.

It is a de Polignac number, because none of the positive numbers 2^k-121272309 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

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

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121272709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 249289 + ... + 249774.

Almost surely, 2^121272309 is an apocalyptic number.

It is an amenable number.

121272309 is a deficient number, since it is larger than the sum of its proper divisors (60386987).

121272309 is an frugal number, since it uses more digits than its factorization.

121272309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499078 (or 499066 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 121272309 is about 11012.3707256885. The cubic root of 121272309 is about 494.9795032835.

The spelling of 121272309 in words is "one hundred twenty-one million, two hundred seventy-two thousand, three hundred nine".