312085129 has 4 divisors (see below), whose sum is σ = 316743184. Its totient is φ = 307427076.

The previous prime is 312085073. The next prime is 312085199. The reversal of 312085129 is 921580213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 312085129 - 2¹⁷ = 311954057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 312085129.

It is not an unprimeable number, because it can be changed into a prime (312085199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2328927 + ... + 2329060.

It is an arithmetic number, because the mean of its divisors is an integer number (79185796).

Almost surely, 2^312085129 is an apocalyptic number.

It is an amenable number.

312085129 is a deficient number, since it is larger than the sum of its proper divisors (4658055).

312085129 is an equidigital number, since it uses as much as digits as its factorization.

312085129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4658054.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 312085129 is about 17665.9313085951. The cubic root of 312085129 is about 678.3039689846.

The spelling of 312085129 in words is "three hundred twelve million, eighty-five thousand, one hundred twenty-nine".