98987221 has 2 divisors, whose sum is σ = 98987222. Its totient is φ = 98987220.

The previous prime is 98987183. The next prime is 98987249. The reversal of 98987221 is 12278989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68062500 + 30924721 = 8250^2 + 5561^2 .

It is an emirp because it is prime and its reverse (12278989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 98987221 - 2¹³ = 98979029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98987261) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49493610 + 49493611.

It is an arithmetic number, because the mean of its divisors is an integer number (49493611).

Almost surely, 2^98987221 is an apocalyptic number.

It is an amenable number.

98987221 is a deficient number, since it is larger than the sum of its proper divisors (1).

98987221 is an equidigital number, since it uses as much as digits as its factorization.

98987221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 46.

The square root of 98987221 is about 9949.2321814299. The cubic root of 98987221 is about 462.5865955215.

The spelling of 98987221 in words is "ninety-eight million, nine hundred eighty-seven thousand, two hundred twenty-one".