287746561 has 2 divisors, whose sum is σ = 287746562. Its totient is φ = 287746560.

The previous prime is 287746559. The next prime is 287746579. The reversal of 287746561 is 165647782.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169806961 + 117939600 = 13031^2 + 10860^2 .

It is a cyclic number.

It is not a de Polignac number, because 287746561 - 2¹ = 287746559 is a prime.

Together with 287746559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (287741561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143873280 + 143873281.

It is an arithmetic number, because the mean of its divisors is an integer number (143873281).

Almost surely, 2^287746561 is an apocalyptic number.

It is an amenable number.

287746561 is a deficient number, since it is larger than the sum of its proper divisors (1).

287746561 is an equidigital number, since it uses as much as digits as its factorization.

287746561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 564480, while the sum is 46.

The square root of 287746561 is about 16963.0940868699. The cubic root of 287746561 is about 660.1916806281.

The spelling of 287746561 in words is "two hundred eighty-seven million, seven hundred forty-six thousand, five hundred sixty-one".