287889381809 has 2 divisors, whose sum is σ = 287889381810. Its totient is φ = 287889381808.

The previous prime is 287889381763. The next prime is 287889381821. The reversal of 287889381809 is 908183988782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 277699488784 + 10189893025 = 526972^2 + 100945^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-287889381809 is a prime.

It is a super-2 number, since 2×287889381809² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (287889387809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143944690904 + 143944690905.

It is an arithmetic number, because the mean of its divisors is an integer number (143944690905).

Almost surely, 2^287889381809 is an apocalyptic number.

It is an amenable number.

287889381809 is a deficient number, since it is larger than the sum of its proper divisors (1).

287889381809 is an equidigital number, since it uses as much as digits as its factorization.

287889381809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 111476736, while the sum is 71.

The spelling of 287889381809 in words is "two hundred eighty-seven billion, eight hundred eighty-nine million, three hundred eighty-one thousand, eight hundred nine".