987878797 has 2 divisors, whose sum is σ = 987878798. Its totient is φ = 987878796.

The previous prime is 987878779. The next prime is 987878807. The reversal of 987878797 is 797878789.

Together with previous prime (987878779) 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., 946546756 + 41332041 = 30766^2 + 6429^2 .

It is a cyclic number.

It is not a de Polignac number, because 987878797 - 2⁷ = 987878669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (987878737) 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, 493939398 + 493939399.

It is an arithmetic number, because the mean of its divisors is an integer number (493939399).

Almost surely, 2^987878797 is an apocalyptic number.

It is an amenable number.

987878797 is a deficient number, since it is larger than the sum of its proper divisors (1).

987878797 is an equidigital number, since it uses as much as digits as its factorization.

987878797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 99574272, while the sum is 70.

The square root of 987878797 is about 31430.5392413175. The cubic root of 987878797 is about 995.9431633320.

It can be divided in two parts, 98787 and 8797, that added together give a square (107584 = 328²).

The spelling of 987878797 in words is "nine hundred eighty-seven million, eight hundred seventy-eight thousand, seven hundred ninety-seven".