13125643 has 4 divisors (see below), whose sum is σ = 13404960. Its totient is φ = 12846328.

The previous prime is 13125611. The next prime is 13125653. The reversal of 13125643 is 34652131.

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

It is a cyclic number.

It is not a de Polignac number, because 13125643 - 2⁵ = 13125611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13125653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139588 + ... + 139681.

It is an arithmetic number, because the mean of its divisors is an integer number (3351240).

Almost surely, 2^13125643 is an apocalyptic number.

13125643 is a deficient number, since it is larger than the sum of its proper divisors (279317).

13125643 is an equidigital number, since it uses as much as digits as its factorization.

13125643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279316.

The product of its digits is 2160, while the sum is 25.

The square root of 13125643 is about 3622.9329278914. The cubic root of 13125643 is about 235.8885509875. Note that the first 3 decimals are identical.

Adding to 13125643 its reverse (34652131), we get a palindrome (47777774).

The spelling of 13125643 in words is "thirteen million, one hundred twenty-five thousand, six hundred forty-three".