987076781 has 2 divisors, whose sum is σ = 987076782. Its totient is φ = 987076780.

The previous prime is 987076711. The next prime is 987076817. The reversal of 987076781 is 187670789.

Together with next prime (987076817) 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., 791915881 + 195160900 = 28141^2 + 13970^2 .

It is an emirp because it is prime and its reverse (187670789) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 987076781 - 2¹⁴ = 987060397 is a prime.

It is a super-2 number, since 2×987076781² = 1948641143178643922, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (987076711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493538390 + 493538391.

It is an arithmetic number, because the mean of its divisors is an integer number (493538391).

Almost surely, 2^987076781 is an apocalyptic number.

It is an amenable number.

987076781 is a deficient number, since it is larger than the sum of its proper divisors (1).

987076781 is an equidigital number, since it uses as much as digits as its factorization.

987076781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1185408, while the sum is 53.

The square root of 987076781 is about 31417.7781041244. The cubic root of 987076781 is about 995.6735693250.

The spelling of 987076781 in words is "nine hundred eighty-seven million, seventy-six thousand, seven hundred eighty-one".