987497857 has 2 divisors, whose sum is σ = 987497858. Its totient is φ = 987497856.

The previous prime is 987497851. The next prime is 987497911. The reversal of 987497857 is 758794789.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 846577216 + 140920641 = 29096^2 + 11871^2 .

It is an emirp because it is prime and its reverse (758794789) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 987497857 - 2¹⁹ = 986973569 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (987497851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493748928 + 493748929.

It is an arithmetic number, because the mean of its divisors is an integer number (493748929).

Almost surely, 2^987497857 is an apocalyptic number.

It is an amenable number.

987497857 is a deficient number, since it is larger than the sum of its proper divisors (1).

987497857 is an equidigital number, since it uses as much as digits as its factorization.

987497857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35562240, while the sum is 64.

The square root of 987497857 is about 31424.4786273376. The cubic root of 987497857 is about 995.8151302956.

The spelling of 987497857 in words is "nine hundred eighty-seven million, four hundred ninety-seven thousand, eight hundred fifty-seven".