312642643 has 2 divisors, whose sum is σ = 312642644. Its totient is φ = 312642642.

The previous prime is 312642641. The next prime is 312642647. The reversal of 312642643 is 346246213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 312642643 - 2¹ = 312642641 is a prime.

Together with 312642641, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (312642641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156321321 + 156321322.

It is an arithmetic number, because the mean of its divisors is an integer number (156321322).

Almost surely, 2^312642643 is an apocalyptic number.

312642643 is a deficient number, since it is larger than the sum of its proper divisors (1).

312642643 is an equidigital number, since it uses as much as digits as its factorization.

312642643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 31.

The square root of 312642643 is about 17681.7036226717. The cubic root of 312642643 is about 678.7076398220.

Adding to 312642643 its reverse (346246213), we get a palindrome (658888856).

The spelling of 312642643 in words is "three hundred twelve million, six hundred forty-two thousand, six hundred forty-three".