1312995643 has 2 divisors, whose sum is σ = 1312995644. Its totient is φ = 1312995642.

The previous prime is 1312995631. The next prime is 1312995667. The reversal of 1312995643 is 3465992131.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1312995643 - 2¹⁷ = 1312864571 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1312995643.

It is not a weakly prime, because it can be changed into another prime (1312995443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656497821 + 656497822.

It is an arithmetic number, because the mean of its divisors is an integer number (656497822).

Almost surely, 2^1312995643 is an apocalyptic number.

1312995643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312995643 is an equidigital number, since it uses as much as digits as its factorization.

1312995643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 43.

The square root of 1312995643 is about 36235.2817430747. The cubic root of 1312995643 is about 1095.0175884528.

The spelling of 1312995643 in words is "one billion, three hundred twelve million, nine hundred ninety-five thousand, six hundred forty-three".