287648981693 has 2 divisors, whose sum is σ = 287648981694. Its totient is φ = 287648981692.

The previous prime is 287648981621. The next prime is 287648981723. The reversal of 287648981693 is 396189846782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191587417849 + 96061563844 = 437707^2 + 309938^2 .

It is a cyclic number.

It is not a de Polignac number, because 287648981693 - 2¹⁰ = 287648980669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (287648981093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143824490846 + 143824490847.

It is an arithmetic number, because the mean of its divisors is an integer number (143824490847).

Almost surely, 2^287648981693 is an apocalyptic number.

It is an amenable number.

287648981693 is a deficient number, since it is larger than the sum of its proper divisors (1).

287648981693 is an equidigital number, since it uses as much as digits as its factorization.

287648981693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 250822656, while the sum is 71.

The spelling of 287648981693 in words is "two hundred eighty-seven billion, six hundred forty-eight million, nine hundred eighty-one thousand, six hundred ninety-three".