12642001 has 2 divisors, whose sum is σ = 12642002. Its totient is φ = 12642000.

The previous prime is 12641987. The next prime is 12642031. The reversal of 12642001 is 10024621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12609601 + 32400 = 3551^2 + 180^2 .

It is a cyclic number.

It is not a de Polignac number, because 12642001 - 2⁵ = 12641969 is a prime.

It is not a weakly prime, because it can be changed into another prime (12642031) 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, 6321000 + 6321001.

It is an arithmetic number, because the mean of its divisors is an integer number (6321001).

Almost surely, 2^12642001 is an apocalyptic number.

It is an amenable number.

12642001 is a deficient number, since it is larger than the sum of its proper divisors (1).

12642001 is an equidigital number, since it uses as much as digits as its factorization.

12642001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 12642001 is about 3555.5591684009. The cubic root of 12642001 is about 232.9549484019.

Adding to 12642001 its reverse (10024621), we get a palindrome (22666622).

The spelling of 12642001 in words is "twelve million, six hundred forty-two thousand, one".