98617921 has 2 divisors, whose sum is σ = 98617922. Its totient is φ = 98617920.

The previous prime is 98617879. The next prime is 98617927. The reversal of 98617921 is 12971689.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80299521 + 18318400 = 8961^2 + 4280^2 .

It is a cyclic number.

It is not a de Polignac number, because 98617921 - 2²¹ = 96520769 is a prime.

It is not a weakly prime, because it can be changed into another prime (98617927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49308960 + 49308961.

It is an arithmetic number, because the mean of its divisors is an integer number (49308961).

Almost surely, 2^98617921 is an apocalyptic number.

It is an amenable number.

98617921 is a deficient number, since it is larger than the sum of its proper divisors (1).

98617921 is an equidigital number, since it uses as much as digits as its factorization.

98617921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 43.

The square root of 98617921 is about 9930.6556178331. The cubic root of 98617921 is about 462.0106083157.

The spelling of 98617921 in words is "ninety-eight million, six hundred seventeen thousand, nine hundred twenty-one".