98877781 has 2 divisors, whose sum is σ = 98877782. Its totient is φ = 98877780.

The previous prime is 98877761. The next prime is 98877787. The reversal of 98877781 is 18777889.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90897156 + 7980625 = 9534^2 + 2825^2 .

It is a cyclic number.

It is not a de Polignac number, because 98877781 - 2¹⁵ = 98845013 is a prime.

It is a super-2 number, since 2×98877781² = 19553631150967922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98877787) 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, 49438890 + 49438891.

It is an arithmetic number, because the mean of its divisors is an integer number (49438891).

Almost surely, 2^98877781 is an apocalyptic number.

It is an amenable number.

98877781 is a deficient number, since it is larger than the sum of its proper divisors (1).

98877781 is an equidigital number, since it uses as much as digits as its factorization.

98877781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1580544, while the sum is 55.

The square root of 98877781 is about 9943.7307385106. The cubic root of 98877781 is about 462.4160544991.

The spelling of 98877781 in words is "ninety-eight million, eight hundred seventy-seven thousand, seven hundred eighty-one".