312643 has 2 divisors, whose sum is σ = 312644. Its totient is φ = 312642.

The previous prime is 312623. The next prime is 312673. The reversal of 312643 is 346213.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312643 is a prime.

312643 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 312643.

It is not a weakly prime, because it can be changed into another prime (312623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156321 + 156322.

It is an arithmetic number, because the mean of its divisors is an integer number (156322).

2³¹²⁶⁴³ is an apocalyptic number.

312643 is a deficient number, since it is larger than the sum of its proper divisors (1).

312643 is an equidigital number, since it uses as much as digits as its factorization.

312643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 19.

The square root of 312643 is about 559.1448828345. The cubic root of 312643 is about 67.8707898156.

Adding to 312643 its reverse (346213), we get a palindrome (658856).

The spelling of 312643 in words is "three hundred twelve thousand, six hundred forty-three".