312006403987 has 2 divisors, whose sum is σ = 312006403988. Its totient is φ = 312006403986.

The previous prime is 312006403949. The next prime is 312006404027. The reversal of 312006403987 is 789304600213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 312006403987 - 2¹¹ = 312006401939 is a prime.

It is a super-2 number, since 2×312006403987² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (312006413987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156003201993 + 156003201994.

It is an arithmetic number, because the mean of its divisors is an integer number (156003201994).

Almost surely, 2^312006403987 is an apocalyptic number.

312006403987 is a deficient number, since it is larger than the sum of its proper divisors (1).

312006403987 is an equidigital number, since it uses as much as digits as its factorization.

312006403987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 312006403987 in words is "three hundred twelve billion, six million, four hundred three thousand, nine hundred eighty-seven".