312534643 has 4 divisors (see below), whose sum is σ = 312851008. Its totient is φ = 312218280.

The previous prime is 312534619. The next prime is 312534661. The reversal of 312534643 is 346435213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312534643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312534683) 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, 156696 + ... + 158677.

It is an arithmetic number, because the mean of its divisors is an integer number (78212752).

Almost surely, 2^312534643 is an apocalyptic number.

312534643 is a deficient number, since it is larger than the sum of its proper divisors (316365).

312534643 is an equidigital number, since it uses as much as digits as its factorization.

312534643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316364.

The product of its digits is 25920, while the sum is 31.

The square root of 312534643 is about 17678.6493545180. The cubic root of 312534643 is about 678.6294793740.

Adding to 312534643 its reverse (346435213), we get a palindrome (658969856).

The spelling of 312534643 in words is "three hundred twelve million, five hundred thirty-four thousand, six hundred forty-three".