312132209 has 4 divisors (see below), whose sum is σ = 328560240. Its totient is φ = 295704180.

The previous prime is 312132173. The next prime is 312132229. The reversal of 312132209 is 902231213.

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, and also an emirpimes, since its reverse is a distinct semiprime: 902231213 = 13 ⋅69402401.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312132209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (312132229) 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 in 3 ways as a sum of consecutive naturals, for example, 8213987 + ... + 8214024.

It is an arithmetic number, because the mean of its divisors is an integer number (82140060).

Almost surely, 2^312132209 is an apocalyptic number.

It is an amenable number.

312132209 is a deficient number, since it is larger than the sum of its proper divisors (16428031).

312132209 is a wasteful number, since it uses less digits than its factorization.

312132209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16428030.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 312132209 is about 17667.2637666391. The cubic root of 312132209 is about 678.3380760729.

The spelling of 312132209 in words is "three hundred twelve million, one hundred thirty-two thousand, two hundred nine".