312111243 has 48 divisors (see below), whose sum is σ = 482017536. Its totient is φ = 194322240.

The previous prime is 312111209. The next prime is 312111257. The reversal of 312111243 is 342111213.

312111243 is a `hidden beast` number, since 312 + 111 + 243 = 666.

It is not a de Polignac number, because 312111243 - 2⁶ = 312111179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (312111643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1016496 + ... + 1016802.

It is an arithmetic number, because the mean of its divisors is an integer number (10042032).

Almost surely, 2^312111243 is an apocalyptic number.

312111243 is a deficient number, since it is larger than the sum of its proper divisors (169906293).

312111243 is a wasteful number, since it uses less digits than its factorization.

312111243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464 (or 461 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 312111243 is about 17666.6703993707. The cubic root of 312111243 is about 678.3228876857.

Adding to 312111243 its reverse (342111213), we get a palindrome (654222456).

The spelling of 312111243 in words is "three hundred twelve million, one hundred eleven thousand, two hundred forty-three".