287949869 has 2 divisors, whose sum is σ = 287949870. Its totient is φ = 287949868.

The previous prime is 287949863. The next prime is 287949899. The reversal of 287949869 is 968949782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 230644969 + 57304900 = 15187^2 + 7570^2 .

It is a cyclic number.

It is not a de Polignac number, because 287949869 - 2²⁴ = 271172653 is a prime.

It is a super-2 number, since 2×287949869² = 165830254114234322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (287949863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143974934 + 143974935.

It is an arithmetic number, because the mean of its divisors is an integer number (143974935).

Almost surely, 2^287949869 is an apocalyptic number.

It is an amenable number.

287949869 is a deficient number, since it is larger than the sum of its proper divisors (1).

287949869 is an equidigital number, since it uses as much as digits as its factorization.

287949869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15676416, while the sum is 62.

The square root of 287949869 is about 16969.0856854458. The cubic root of 287949869 is about 660.3471306770.

The spelling of 287949869 in words is "two hundred eighty-seven million, nine hundred forty-nine thousand, eight hundred sixty-nine".