287188961 has 2 divisors, whose sum is σ = 287188962. Its totient is φ = 287188960.

The previous prime is 287188901. The next prime is 287188987. The reversal of 287188961 is 169881782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210801361 + 76387600 = 14519^2 + 8740^2 .

It is a cyclic number.

It is not a de Polignac number, because 287188961 - 2⁶ = 287188897 is a prime.

It is not a weakly prime, because it can be changed into another prime (287188901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143594480 + 143594481.

It is an arithmetic number, because the mean of its divisors is an integer number (143594481).

Almost surely, 2^287188961 is an apocalyptic number.

It is an amenable number.

287188961 is a deficient number, since it is larger than the sum of its proper divisors (1).

287188961 is an equidigital number, since it uses as much as digits as its factorization.

287188961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 50.

The square root of 287188961 is about 16946.6504360006. The cubic root of 287188961 is about 659.7649614567.

The spelling of 287188961 in words is "two hundred eighty-seven million, one hundred eighty-eight thousand, nine hundred sixty-one".