312140819 has 2 divisors, whose sum is σ = 312140820. Its totient is φ = 312140818.

The previous prime is 312140813. The next prime is 312140861. The reversal of 312140819 is 918041213.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312140819 is a prime.

It is a super-2 number, since 2×312140819² = 194863781771981522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 312140791 and 312140800.

It is not a weakly prime, because it can be changed into another prime (312140813) 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 as a sum of consecutive naturals, namely, 156070409 + 156070410.

It is an arithmetic number, because the mean of its divisors is an integer number (156070410).

Almost surely, 2^312140819 is an apocalyptic number.

312140819 is a deficient number, since it is larger than the sum of its proper divisors (1).

312140819 is an equidigital number, since it uses as much as digits as its factorization.

312140819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 312140819 is about 17667.5074359684. The cubic root of 312140819 is about 678.3443132132.

The spelling of 312140819 in words is "three hundred twelve million, one hundred forty thousand, eight hundred nineteen".