312019993 has 4 divisors (see below), whose sum is σ = 312081700. Its totient is φ = 311958288.

The previous prime is 312019973. The next prime is 312019999. The reversal of 312019993 is 399910213.

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

It can be written as a sum of positive squares in 2 ways, for example, as 272481049 + 39538944 = 16507^2 + 6288^2 .

It is a cyclic number.

It is not a de Polignac number, because 312019993 - 2¹³ = 312011801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312019999) 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, 22518 + ... + 33631.

It is an arithmetic number, because the mean of its divisors is an integer number (78020425).

Almost surely, 2^312019993 is an apocalyptic number.

It is an amenable number.

312019993 is a deficient number, since it is larger than the sum of its proper divisors (61707).

312019993 is an equidigital number, since it uses as much as digits as its factorization.

312019993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61706.

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 312019993 is about 17664.0876639582. The cubic root of 312019993 is about 678.2567755777.

The spelling of 312019993 in words is "three hundred twelve million, nineteen thousand, nine hundred ninety-three".