1312654643 has 16 divisors (see below), whose sum is σ = 1453723200. Its totient is φ = 1178935296.

The previous prime is 1312654639. The next prime is 1312654649. The reversal of 1312654643 is 3464562131.

It is a cyclic number.

It is not a de Polignac number, because 1312654643 - 2² = 1312654639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312654649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171821 + ... + 179297.

It is an arithmetic number, because the mean of its divisors is an integer number (90857700).

Almost surely, 2^1312654643 is an apocalyptic number.

1312654643 is a deficient number, since it is larger than the sum of its proper divisors (141068557).

1312654643 is a wasteful number, since it uses less digits than its factorization.

1312654643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7966.

The product of its digits is 51840, while the sum is 35.

The square root of 1312654643 is about 36230.5760787763. The cubic root of 1312654643 is about 1094.9227840438.

The spelling of 1312654643 in words is "one billion, three hundred twelve million, six hundred fifty-four thousand, six hundred forty-three".