287009869 has 2 divisors, whose sum is σ = 287009870. Its totient is φ = 287009868.

The previous prime is 287009837. The next prime is 287009887. The reversal of 287009869 is 968900782.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149768644 + 137241225 = 12238^2 + 11715^2 .

It is a cyclic number.

It is not a de Polignac number, because 287009869 - 2⁵ = 287009837 is a prime.

It is a super-2 number, since 2×287009869² = 164749329806794322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (287009369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143504934 + 143504935.

It is an arithmetic number, because the mean of its divisors is an integer number (143504935).

Almost surely, 2^287009869 is an apocalyptic number.

It is an amenable number.

287009869 is a deficient number, since it is larger than the sum of its proper divisors (1).

287009869 is an equidigital number, since it uses as much as digits as its factorization.

287009869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 287009869 is about 16941.3656179188. The cubic root of 287009869 is about 659.6277890576.

The spelling of 287009869 in words is "two hundred eighty-seven million, nine thousand, eight hundred sixty-nine".