12903661 has 4 divisors (see below), whose sum is σ = 12951900. Its totient is φ = 12855424.

The previous prime is 12903647. The next prime is 12903703. The reversal of 12903661 is 16630921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4866436 + 8037225 = 2206^2 + 2835^2 .

It is a cyclic number.

It is not a de Polignac number, because 12903661 - 2²³ = 4515053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12903461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23716 + ... + 24253.

It is an arithmetic number, because the mean of its divisors is an integer number (3237975).

Almost surely, 2^12903661 is an apocalyptic number.

It is an amenable number.

12903661 is a deficient number, since it is larger than the sum of its proper divisors (48239).

12903661 is an equidigital number, since it uses as much as digits as its factorization.

12903661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48238.

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

The square root of 12903661 is about 3592.1666164030. The cubic root of 12903661 is about 234.5511941123.

The spelling of 12903661 in words is "twelve million, nine hundred three thousand, six hundred sixty-one".