287097561 has 8 divisors (see below), whose sum is σ = 425329760. Its totient is φ = 191398356.

The previous prime is 287097553. The next prime is 287097589. The reversal of 287097561 is 165790782.

287097561 is a `hidden beast` number, since 2 + 87 + 0 + 9 + 7 + 561 = 666.

It is not a de Polignac number, because 287097561 - 2³ = 287097553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (287097511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5316595 + ... + 5316648.

It is an arithmetic number, because the mean of its divisors is an integer number (53166220).

Almost surely, 2^287097561 is an apocalyptic number.

It is an amenable number.

287097561 is a deficient number, since it is larger than the sum of its proper divisors (138232199).

287097561 is a wasteful number, since it uses less digits than its factorization.

287097561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10633252 (or 10633246 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 287097561 is about 16943.9535233074. The cubic root of 287097561 is about 659.6949623457.

The spelling of 287097561 in words is "two hundred eighty-seven million, ninety-seven thousand, five hundred sixty-one".