312199889 has 2 divisors, whose sum is σ = 312199890. Its totient is φ = 312199888.

The previous prime is 312199879. The next prime is 312199913. The reversal of 312199889 is 988991213.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 295324225 + 16875664 = 17185^2 + 4108^2 .

It is a cyclic number.

It is not a de Polignac number, because 312199889 - 2⁴ = 312199873 is a prime.

It is a super-2 number, since 2×312199889² = 194937541383224642, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (312199879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156099944 + 156099945.

It is an arithmetic number, because the mean of its divisors is an integer number (156099945).

Almost surely, 2^312199889 is an apocalyptic number.

It is an amenable number.

312199889 is a deficient number, since it is larger than the sum of its proper divisors (1).

312199889 is an equidigital number, since it uses as much as digits as its factorization.

312199889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 50.

The square root of 312199889 is about 17669.1790697814. The cubic root of 312199889 is about 678.3871008150.

The spelling of 312199889 in words is "three hundred twelve million, one hundred ninety-nine thousand, eight hundred eighty-nine".