12201961 has 2 divisors, whose sum is σ = 12201962. Its totient is φ = 12201960.

The previous prime is 12201923. The next prime is 12201991. The reversal of 12201961 is 16910221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6350400 + 5851561 = 2520^2 + 2419^2 .

It is a cyclic number.

It is not a de Polignac number, because 12201961 - 2²³ = 3813353 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12201901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6100980 + 6100981.

It is an arithmetic number, because the mean of its divisors is an integer number (6100981).

Almost surely, 2^12201961 is an apocalyptic number.

It is an amenable number.

12201961 is a deficient number, since it is larger than the sum of its proper divisors (1).

12201961 is an equidigital number, since it uses as much as digits as its factorization.

12201961 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 22.

The square root of 12201961 is about 3493.1305443685. The cubic root of 12201961 is about 230.2200854907.

The spelling of 12201961 in words is "twelve million, two hundred one thousand, nine hundred sixty-one".