98187721 has 2 divisors, whose sum is σ = 98187722. Its totient is φ = 98187720.

The previous prime is 98187709. The next prime is 98187781. The reversal of 98187721 is 12778189.

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., 58308496 + 39879225 = 7636^2 + 6315^2 .

It is an emirp because it is prime and its reverse (12778189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 98187721 - 2⁵ = 98187689 is a prime.

It is not a weakly prime, because it can be changed into another prime (98187781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49093860 + 49093861.

It is an arithmetic number, because the mean of its divisors is an integer number (49093861).

Almost surely, 2^98187721 is an apocalyptic number.

It is an amenable number.

98187721 is a deficient number, since it is larger than the sum of its proper divisors (1).

98187721 is an equidigital number, since it uses as much as digits as its factorization.

98187721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 43.

The square root of 98187721 is about 9908.9717428197. The cubic root of 98187721 is about 461.3378209359.

The spelling of 98187721 in words is "ninety-eight million, one hundred eighty-seven thousand, seven hundred twenty-one".