287117213 has 2 divisors, whose sum is σ = 287117214. Its totient is φ = 287117212.

The previous prime is 287117191. The next prime is 287117239. The reversal of 287117213 is 312711782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 287031364 + 85849 = 16942^2 + 293^2 .

It is a cyclic number.

It is not a de Polignac number, because 287117213 - 2²⁴ = 270339997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 287117213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (287117263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143558606 + 143558607.

It is an arithmetic number, because the mean of its divisors is an integer number (143558607).

Almost surely, 2^287117213 is an apocalyptic number.

It is an amenable number.

287117213 is a deficient number, since it is larger than the sum of its proper divisors (1).

287117213 is an equidigital number, since it uses as much as digits as its factorization.

287117213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 32.

The square root of 287117213 is about 16944.5334252673. The cubic root of 287117213 is about 659.7100141741.

Adding to 287117213 its reverse (312711782), we get a palindrome (599828995).

The spelling of 287117213 in words is "two hundred eighty-seven million, one hundred seventeen thousand, two hundred thirteen".