1313643 has 4 divisors (see below), whose sum is σ = 1751528. Its totient is φ = 875760.

The previous prime is 1313633. The next prime is 1313651. The reversal of 1313643 is 3463131.

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

It is not a de Polignac number, because 1313643 - 2⁶ = 1313579 is a prime.

It is a D-number.

It is a Duffinian number.

1313643 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1313623) 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, 218938 + ... + 218943.

It is an arithmetic number, because the mean of its divisors is an integer number (437882).

2^1313643 is an apocalyptic number.

1313643 is a deficient number, since it is larger than the sum of its proper divisors (437885).

1313643 is an equidigital number, since it uses as much as digits as its factorization.

1313643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437884.

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

The square root of 1313643 is about 1146.1426612774. The cubic root of 1313643 is about 109.5197520716.

Adding to 1313643 its reverse (3463131), we get a palindrome (4776774).

The spelling of 1313643 in words is "one million, three hundred thirteen thousand, six hundred forty-three".