312203989 has 2 divisors, whose sum is σ = 312203990. Its totient is φ = 312203988.

The previous prime is 312203981. The next prime is 312204017. The reversal of 312203989 is 989302213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 304223364 + 7980625 = 17442^2 + 2825^2 .

It is a cyclic number.

It is not a de Polignac number, because 312203989 - 2³ = 312203981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312203981) by changing a digit.

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 as a sum of consecutive naturals, namely, 156101994 + 156101995.

It is an arithmetic number, because the mean of its divisors is an integer number (156101995).

Almost surely, 2^312203989 is an apocalyptic number.

It is an amenable number.

312203989 is a deficient number, since it is larger than the sum of its proper divisors (1).

312203989 is an equidigital number, since it uses as much as digits as its factorization.

312203989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 312203989 is about 17669.2950906368. The cubic root of 312203989 is about 678.3900704668.

The spelling of 312203989 in words is "three hundred twelve million, two hundred three thousand, nine hundred eighty-nine".