98128781 has 2 divisors, whose sum is σ = 98128782. Its totient is φ = 98128780.

The previous prime is 98128763. The next prime is 98128801. The reversal of 98128781 is 18782189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94672900 + 3455881 = 9730^2 + 1859^2 .

It is a cyclic number.

It is not a de Polignac number, because 98128781 - 2¹⁴ = 98112397 is a prime.

It is a super-2 number, since 2×98128781² = 19258515321091922, 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 (98121781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49064390 + 49064391.

It is an arithmetic number, because the mean of its divisors is an integer number (49064391).

Almost surely, 2^98128781 is an apocalyptic number.

It is an amenable number.

98128781 is a deficient number, since it is larger than the sum of its proper divisors (1).

98128781 is an equidigital number, since it uses as much as digits as its factorization.

98128781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 44.

The square root of 98128781 is about 9905.9972239043. The cubic root of 98128781 is about 461.2454920327.

The spelling of 98128781 in words is "ninety-eight million, one hundred twenty-eight thousand, seven hundred eighty-one".