13103643 has 8 divisors (see below), whose sum is σ = 19967488. Its totient is φ = 7487784.

The previous prime is 13103627. The next prime is 13103677. The reversal of 13103643 is 34630131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13103643 - 2⁴ = 13103627 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 623983 = 13103643 / (1 + 3 + 1 + 0 + 3 + 6 + 4 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13103683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311971 + ... + 312012.

It is an arithmetic number, because the mean of its divisors is an integer number (2495936).

Almost surely, 2^13103643 is an apocalyptic number.

13103643 is a deficient number, since it is larger than the sum of its proper divisors (6863845).

13103643 is an equidigital number, since it uses as much as digits as its factorization.

13103643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623993.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 13103643 is about 3619.8954404789. The cubic root of 13103643 is about 235.7566856955.

Adding to 13103643 its reverse (34630131), we get a palindrome (47733774).

The spelling of 13103643 in words is "thirteen million, one hundred three thousand, six hundred forty-three".