287546561 has 2 divisors, whose sum is σ = 287546562. Its totient is φ = 287546560.

The previous prime is 287546549. The next prime is 287546569. The reversal of 287546561 is 165645782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144600625 + 142945936 = 12025^2 + 11956^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-287546561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (287546569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143773280 + 143773281.

It is an arithmetic number, because the mean of its divisors is an integer number (143773281).

Almost surely, 2^287546561 is an apocalyptic number.

It is an amenable number.

287546561 is a deficient number, since it is larger than the sum of its proper divisors (1).

287546561 is an equidigital number, since it uses as much as digits as its factorization.

287546561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 403200, while the sum is 44.

The square root of 287546561 is about 16957.1979112116. The cubic root of 287546561 is about 660.0386884269.

The spelling of 287546561 in words is "two hundred eighty-seven million, five hundred forty-six thousand, five hundred sixty-one".