12500001 has 10 divisors (see below), whose sum is σ = 18672962. Its totient is φ = 8333280.

The previous prime is 12499999. The next prime is 12500003. The reversal of 12500001 is 10000521.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12499999) and next prime (12500003).

It can be written as a sum of positive squares in only one way, i.e., 7834401 + 4665600 = 2799^2 + 2160^2 .

It is not a de Polignac number, because 12500001 - 2¹ = 12499999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12500003) 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 9 ways as a sum of consecutive naturals, for example, 77080 + ... + 77241.

Almost surely, 2^12500001 is an apocalyptic number.

It is an amenable number.

12500001 is a deficient number, since it is larger than the sum of its proper divisors (6172961).

12500001 is an equidigital number, since it uses as much as digits as its factorization.

12500001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154333 (or 154324 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 12500001 is about 3535.5340473541. The cubic root of 12500001 is about 232.0794478694.

Adding to 12500001 its reverse (10000521), we get a palindrome (22500522).

The spelling of 12500001 in words is "twelve million, five hundred thousand, one".