286661887 has 2 divisors, whose sum is σ = 286661888. Its totient is φ = 286661886.

The previous prime is 286661863. The next prime is 286661891. The reversal of 286661887 is 788166682.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-286661887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686661887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143330943 + 143330944.

It is an arithmetic number, because the mean of its divisors is an integer number (143330944).

Almost surely, 2^286661887 is an apocalyptic number.

286661887 is a deficient number, since it is larger than the sum of its proper divisors (1).

286661887 is an equidigital number, since it uses as much as digits as its factorization.

286661887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1548288, while the sum is 52.

The square root of 286661887 is about 16931.0923156186. The cubic root of 286661887 is about 659.3610950610.

The spelling of 286661887 in words is "two hundred eighty-six million, six hundred sixty-one thousand, eight hundred eighty-seven".