98128661 has 2 divisors, whose sum is σ = 98128662. Its totient is φ = 98128660.

The previous prime is 98128643. The next prime is 98128729. The reversal of 98128661 is 16682189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73427761 + 24700900 = 8569^2 + 4970^2 .

It is a cyclic number.

It is not a de Polignac number, because 98128661 - 2¹⁴ = 98112277 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98128631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49064330 + 49064331.

It is an arithmetic number, because the mean of its divisors is an integer number (49064331).

Almost surely, 2^98128661 is an apocalyptic number.

It is an amenable number.

98128661 is a deficient number, since it is larger than the sum of its proper divisors (1).

98128661 is an equidigital number, since it uses as much as digits as its factorization.

98128661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 41.

The square root of 98128661 is about 9905.9911669656. The cubic root of 98128661 is about 461.2453040163.

It can be divided in two parts, 98128 and 661, that added together give a palindrome (98789).

The spelling of 98128661 in words is "ninety-eight million, one hundred twenty-eight thousand, six hundred sixty-one".