12309961 has 2 divisors, whose sum is σ = 12309962. Its totient is φ = 12309960.

The previous prime is 12309953. The next prime is 12310013. The reversal of 12309961 is 16990321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11943936 + 366025 = 3456^2 + 605^2 .

It is a cyclic number.

It is not a de Polignac number, because 12309961 - 2³ = 12309953 is a prime.

It is not a weakly prime, because it can be changed into another prime (12309931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6154980 + 6154981.

It is an arithmetic number, because the mean of its divisors is an integer number (6154981).

Almost surely, 2^12309961 is an apocalyptic number.

It is an amenable number.

12309961 is a deficient number, since it is larger than the sum of its proper divisors (1).

12309961 is an equidigital number, since it uses as much as digits as its factorization.

12309961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 12309961 is about 3508.5554007312. Note that the first 3 decimals coincide. The cubic root of 12309961 is about 230.8973201069.

The spelling of 12309961 in words is "twelve million, three hundred nine thousand, nine hundred sixty-one".