287581361 has 2 divisors, whose sum is σ = 287581362. Its totient is φ = 287581360.

The previous prime is 287581337. The next prime is 287581369. The reversal of 287581361 is 163185782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171610000 + 115971361 = 13100^2 + 10769^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-287581361 is a prime.

It is a super-2 number, since 2×287581361² = 165406078389224642, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (287581369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143790680 + 143790681.

It is an arithmetic number, because the mean of its divisors is an integer number (143790681).

Almost surely, 2^287581361 is an apocalyptic number.

It is an amenable number.

287581361 is a deficient number, since it is larger than the sum of its proper divisors (1).

287581361 is an equidigital number, since it uses as much as digits as its factorization.

287581361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 41.

The square root of 287581361 is about 16958.2239930955. The cubic root of 287581361 is about 660.0653141668.

The spelling of 287581361 in words is "two hundred eighty-seven million, five hundred eighty-one thousand, three hundred sixty-one".