312019 has 4 divisors (see below), whose sum is σ = 316744. Its totient is φ = 307296.

The previous prime is 312007. The next prime is 312023. The reversal of 312019 is 910213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 312019 - 2¹³ = 303827 is a prime.

It is a super-2 number, since 2×312019² = 194711712722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311993 and 312011.

It is not an unprimeable number, because it can be changed into a prime (312029) 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, 2262 + ... + 2395.

It is an arithmetic number, because the mean of its divisors is an integer number (79186).

2³¹²⁰¹⁹ is an apocalyptic number.

312019 is the 323-rd hex number.

312019 is a deficient number, since it is larger than the sum of its proper divisors (4725).

312019 is an equidigital number, since it uses as much as digits as its factorization.

312019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4724.

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

The square root of 312019 is about 558.5866092201. The cubic root of 312019 is about 67.8256056062.

The spelling of 312019 in words is "three hundred twelve thousand, nineteen".