12661903 has 2 divisors, whose sum is σ = 12661904. Its totient is φ = 12661902.

The previous prime is 12661879. The next prime is 12661949. The reversal of 12661903 is 30916621.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12661903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12661973) 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, 6330951 + 6330952.

It is an arithmetic number, because the mean of its divisors is an integer number (6330952).

Almost surely, 2^12661903 is an apocalyptic number.

12661903 is a deficient number, since it is larger than the sum of its proper divisors (1).

12661903 is an equidigital number, since it uses as much as digits as its factorization.

12661903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 12661903 is about 3558.3567836854. The cubic root of 12661903 is about 233.0771294444.

The spelling of 12661903 in words is "twelve million, six hundred sixty-one thousand, nine hundred three".