312240031 has 2 divisors, whose sum is σ = 312240032. Its totient is φ = 312240030.

The previous prime is 312240001. The next prime is 312240073. The reversal of 312240031 is 130042213.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 312240031 - 2²⁵ = 278685599 is a prime.

It is a super-2 number, since 2×312240031² = 194987673917761922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 312239987 and 312240014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312240001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156120015 + 156120016.

It is an arithmetic number, because the mean of its divisors is an integer number (156120016).

Almost surely, 2^312240031 is an apocalyptic number.

312240031 is a deficient number, since it is larger than the sum of its proper divisors (1).

312240031 is an equidigital number, since it uses as much as digits as its factorization.

312240031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 312240031 is about 17670.3149660667. The cubic root of 312240031 is about 678.4161747608.

Adding to 312240031 its reverse (130042213), we get a palindrome (442282244).

The spelling of 312240031 in words is "three hundred twelve million, two hundred forty thousand, thirty-one".