981857498177 has 2 divisors, whose sum is σ = 981857498178. Its totient is φ = 981857498176.

The previous prime is 981857498159. The next prime is 981857498197. The reversal of 981857498177 is 771894758189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664166321296 + 317691176881 = 814964^2 + 563641^2 .

It is a cyclic number.

It is not a de Polignac number, because 981857498177 - 2¹⁸ = 981857236033 is a prime.

It is not a weakly prime, because it can be changed into another prime (981857498117) 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, 490928749088 + 490928749089.

It is an arithmetic number, because the mean of its divisors is an integer number (490928749089).

Almost surely, 2^981857498177 is an apocalyptic number.

It is an amenable number.

981857498177 is a deficient number, since it is larger than the sum of its proper divisors (1).

981857498177 is an equidigital number, since it uses as much as digits as its factorization.

981857498177 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 284497920, while the sum is 74.

The spelling of 981857498177 in words is "nine hundred eighty-one billion, eight hundred fifty-seven million, four hundred ninety-eight thousand, one hundred seventy-seven".