12543001 has 4 divisors (see below), whose sum is σ = 12563152. Its totient is φ = 12522852.

The previous prime is 12542989. The next prime is 12543053. The reversal of 12543001 is 10034521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10034521 = 7 ⋅1433503.

It is a cyclic number.

It is not a de Polignac number, because 12543001 - 2¹¹ = 12540953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12543061) 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, 9111 + ... + 10396.

It is an arithmetic number, because the mean of its divisors is an integer number (3140788).

Almost surely, 2^12543001 is an apocalyptic number.

It is an amenable number.

12543001 is a deficient number, since it is larger than the sum of its proper divisors (20151).

12543001 is an equidigital number, since it uses as much as digits as its factorization.

12543001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20150.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 12543001 is about 3541.6099446438. The cubic root of 12543001 is about 232.3452610485.

Adding to 12543001 its reverse (10034521), we get a palindrome (22577522).

The spelling of 12543001 in words is "twelve million, five hundred forty-three thousand, one".