287971213 has 2 divisors, whose sum is σ = 287971214. Its totient is φ = 287971212.

The previous prime is 287971171. The next prime is 287971231. The reversal of 287971213 is 312179782.

It is a happy number.

Together with next prime (287971231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 286895844 + 1075369 = 16938^2 + 1037^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-287971213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (287971253) 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, 143985606 + 143985607.

It is an arithmetic number, because the mean of its divisors is an integer number (143985607).

Almost surely, 2^287971213 is an apocalyptic number.

It is an amenable number.

287971213 is a deficient number, since it is larger than the sum of its proper divisors (1).

287971213 is an equidigital number, since it uses as much as digits as its factorization.

287971213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 40.

The square root of 287971213 is about 16969.7145821608. The cubic root of 287971213 is about 660.3634461338.

The spelling of 287971213 in words is "two hundred eighty-seven million, nine hundred seventy-one thousand, two hundred thirteen".