287636161 has 2 divisors, whose sum is σ = 287636162. Its totient is φ = 287636160.

The previous prime is 287636149. The next prime is 287636177. The reversal of 287636161 is 161636782.

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., 274531761 + 13104400 = 16569^2 + 3620^2 .

It is a cyclic number.

It is not a de Polignac number, because 287636161 - 2¹³ = 287627969 is a prime.

It is a super-2 number, since 2×287636161² = 165469122229635842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (287636101) 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 as a sum of consecutive naturals, namely, 143818080 + 143818081.

It is an arithmetic number, because the mean of its divisors is an integer number (143818081).

Almost surely, 2^287636161 is an apocalyptic number.

It is an amenable number.

287636161 is a deficient number, since it is larger than the sum of its proper divisors (1).

287636161 is an equidigital number, since it uses as much as digits as its factorization.

287636161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 40.

The square root of 287636161 is about 16959.8396513646. The cubic root of 287636161 is about 660.1072377020.

The spelling of 287636161 in words is "two hundred eighty-seven million, six hundred thirty-six thousand, one hundred sixty-one".