12355661 has 2 divisors, whose sum is σ = 12355662. Its totient is φ = 12355660.

The previous prime is 12355657. The next prime is 12355687. The reversal of 12355661 is 16655321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12180100 + 175561 = 3490^2 + 419^2 .

It is a cyclic number.

It is not a de Polignac number, because 12355661 - 2² = 12355657 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12355601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6177830 + 6177831.

It is an arithmetic number, because the mean of its divisors is an integer number (6177831).

Almost surely, 2^12355661 is an apocalyptic number.

It is an amenable number.

12355661 is a deficient number, since it is larger than the sum of its proper divisors (1).

12355661 is an equidigital number, since it uses as much as digits as its factorization.

12355661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 29.

The square root of 12355661 is about 3515.0620193675. The cubic root of 12355661 is about 231.1826981162.

The spelling of 12355661 in words is "twelve million, three hundred fifty-five thousand, six hundred sixty-one".