855530987 has 2 divisors, whose sum is σ = 855530988. Its totient is φ = 855530986.

The previous prime is 855530971. The next prime is 855531007. The reversal of 855530987 is 789035558.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 855530987 - 2⁴ = 855530971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (855530957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427765493 + 427765494.

It is an arithmetic number, because the mean of its divisors is an integer number (427765494).

Almost surely, 2^855530987 is an apocalyptic number.

855530987 is a deficient number, since it is larger than the sum of its proper divisors (1).

855530987 is an equidigital number, since it uses as much as digits as its factorization.

855530987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512000, while the sum is 50.

The square root of 855530987 is about 29249.4613112789. The cubic root of 855530987 is about 949.3184352372.

The spelling of 855530987 in words is "eight hundred fifty-five million, five hundred thirty thousand, nine hundred eighty-seven".