1312426643 has 4 divisors (see below), whose sum is σ = 1431738168. Its totient is φ = 1193115120.

The previous prime is 1312426597. The next prime is 1312426649. The reversal of 1312426643 is 3466242131.

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 1312426643 - 2⁶ = 1312426579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312426649) 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, 59655746 + ... + 59655767.

It is an arithmetic number, because the mean of its divisors is an integer number (357934542).

Almost surely, 2^1312426643 is an apocalyptic number.

1312426643 is a deficient number, since it is larger than the sum of its proper divisors (119311525).

1312426643 is a wasteful number, since it uses less digits than its factorization.

1312426643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119311524.

The product of its digits is 20736, while the sum is 32.

The square root of 1312426643 is about 36227.4294285421. The cubic root of 1312426643 is about 1094.8593865992.

Adding to 1312426643 its reverse (3466242131), we get a palindrome (4778668774).

The spelling of 1312426643 in words is "one billion, three hundred twelve million, four hundred twenty-six thousand, six hundred forty-three".