312109 has 4 divisors (see below), whose sum is σ = 356704. Its totient is φ = 267516.

The previous prime is 312107. The next prime is 312121. The reversal of 312109 is 901213.

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 312109 - 2¹ = 312107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312092 and 312101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22287 + ... + 22300.

It is an arithmetic number, because the mean of its divisors is an integer number (89176).

2³¹²¹⁰⁹ is an apocalyptic number.

It is an amenable number.

312109 is a deficient number, since it is larger than the sum of its proper divisors (44595).

312109 is an equidigital number, since it uses as much as digits as its factorization.

312109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44594.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 312109 is about 558.6671638820. The cubic root of 312109 is about 67.8321262750.

The spelling of 312109 in words is "three hundred twelve thousand, one hundred nine".