1343256643 has 4 divisors (see below), whose sum is σ = 1344244968. Its totient is φ = 1342268320.

The previous prime is 1343256613. The next prime is 1343256659. The reversal of 1343256643 is 3466523431.

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 1343256643 - 2²⁹ = 806385731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1343256613) 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, 492121 + ... + 494842.

It is an arithmetic number, because the mean of its divisors is an integer number (336061242).

Almost surely, 2^1343256643 is an apocalyptic number.

1343256643 is a deficient number, since it is larger than the sum of its proper divisors (988325).

1343256643 is an equidigital number, since it uses as much as digits as its factorization.

1343256643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988324.

The product of its digits is 155520, while the sum is 37.

The square root of 1343256643 is about 36650.4657951301. The cubic root of 1343256643 is about 1103.3661741416.

The spelling of 1343256643 in words is "one billion, three hundred forty-three million, two hundred fifty-six thousand, six hundred forty-three".