287181307449 has 27 divisors (see below), whose sum is σ = 420749661423. Its totient is φ = 188754376032.

The previous prime is 287181307403. The next prime is 287181307463. The reversal of 287181307449 is 944703181782.

The square root of 287181307449 is 535893.

It is a perfect power (a square), and thus also a powerful number.

287181307449 is a `hidden beast` number, since 28 + 71 + 81 + 30 + 7 + 449 = 666.

It can be written as a sum of positive squares in only one way, i.e., 163018100025 + 124163207424 = 403755^2 + 352368^2 .

It is not a de Polignac number, because 287181307449 - 2⁷ = 287181307321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 287181307395 and 287181307404.

It is not an unprimeable number, because it can be changed into a prime (287181307549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 117359344 + ... + 117361790.

Almost surely, 2^287181307449 is an apocalyptic number.

287181307449 is the 535893-rd square number.

287181307449 is the 267947-th centered octagonal number.

It is an amenable number.

287181307449 is a deficient number, since it is larger than the sum of its proper divisors (133568353974).

287181307449 is an frugal number, since it uses more digits than its factorization.

287181307449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5046 (or 2523 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 54.

The spelling of 287181307449 in words is "two hundred eighty-seven billion, one hundred eighty-one million, three hundred seven thousand, four hundred forty-nine".