98561993 has 2 divisors, whose sum is σ = 98561994. Its totient is φ = 98561992.

The previous prime is 98561959. The next prime is 98562019. The reversal of 98561993 is 39916589.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52823824 + 45738169 = 7268^2 + 6763^2 .

It is a cyclic number.

It is not a de Polignac number, because 98561993 - 2¹⁶ = 98496457 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (98561933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49280996 + 49280997.

It is an arithmetic number, because the mean of its divisors is an integer number (49280997).

Almost surely, 2^98561993 is an apocalyptic number.

It is an amenable number.

98561993 is a deficient number, since it is larger than the sum of its proper divisors (1).

98561993 is an equidigital number, since it uses as much as digits as its factorization.

98561993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 50.

The square root of 98561993 is about 9927.8392916082. The cubic root of 98561993 is about 461.9232536198.

The spelling of 98561993 in words is "ninety-eight million, five hundred sixty-one thousand, nine hundred ninety-three".