312643949 has 2 divisors, whose sum is σ = 312643950. Its totient is φ = 312643948.

The previous prime is 312643921. The next prime is 312644023. The reversal of 312643949 is 949346213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 288388324 + 24255625 = 16982^2 + 4925^2 .

It is an emirp because it is prime and its reverse (949346213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 312643949 - 2¹² = 312639853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312643249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156321974 + 156321975.

It is an arithmetic number, because the mean of its divisors is an integer number (156321975).

Almost surely, 2^312643949 is an apocalyptic number.

It is an amenable number.

312643949 is a deficient number, since it is larger than the sum of its proper divisors (1).

312643949 is an equidigital number, since it uses as much as digits as its factorization.

312643949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 41.

The square root of 312643949 is about 17681.7405534636. The cubic root of 312643949 is about 678.7085848743.

The spelling of 312643949 in words is "three hundred twelve million, six hundred forty-three thousand, nine hundred forty-nine".