312129005 has 6 divisors (see below), whose sum is σ = 374602218. Its totient is φ = 249671600.

The previous prime is 312128989. The next prime is 312129019. The reversal of 312129005 is 500921213.

It can be written as a sum of positive squares in 3 ways, for example, as 75307684 + 236821321 = 8678^2 + 15389^2 .

It is not a de Polignac number, because 312129005 - 2⁴ = 312128989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 35555 + ... + 43455.

It is an arithmetic number, because the mean of its divisors is an integer number (62433703).

Almost surely, 2^312129005 is an apocalyptic number.

It is an amenable number.

312129005 is a deficient number, since it is larger than the sum of its proper divisors (62473213).

312129005 is an frugal number, since it uses more digits than its factorization.

312129005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15807 (or 7906 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 312129005 is about 17667.1730902258. The cubic root of 312129005 is about 678.3357550450.

The spelling of 312129005 in words is "three hundred twelve million, one hundred twenty-nine thousand, five".