287666969 has 2 divisors, whose sum is σ = 287666970. Its totient is φ = 287666968.

The previous prime is 287666963. The next prime is 287667031. The reversal of 287666969 is 969666782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 286015744 + 1651225 = 16912^2 + 1285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-287666969 is a prime.

It is a super-2 number, since 2×287666969² = 165504570107293922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (287666963) 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, 143833484 + 143833485.

It is an arithmetic number, because the mean of its divisors is an integer number (143833485).

Almost surely, 2^287666969 is an apocalyptic number.

It is an amenable number.

287666969 is a deficient number, since it is larger than the sum of its proper divisors (1).

287666969 is an equidigital number, since it uses as much as digits as its factorization.

287666969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11757312, while the sum is 59.

The square root of 287666969 is about 16960.7478903496. The cubic root of 287666969 is about 660.1308043468.

The spelling of 287666969 in words is "two hundred eighty-seven million, six hundred sixty-six thousand, nine hundred sixty-nine".