98181997 has 2 divisors, whose sum is σ = 98181998. Its totient is φ = 98181996.

The previous prime is 98181961. The next prime is 98182027. The reversal of 98181997 is 79918189.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69655716 + 28526281 = 8346^2 + 5341^2 .

It is a cyclic number.

It is not a de Polignac number, because 98181997 - 2¹⁵ = 98149229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98181397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49090998 + 49090999.

It is an arithmetic number, because the mean of its divisors is an integer number (49090999).

Almost surely, 2^98181997 is an apocalyptic number.

It is an amenable number.

98181997 is a deficient number, since it is larger than the sum of its proper divisors (1).

98181997 is an equidigital number, since it uses as much as digits as its factorization.

98181997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 52.

The square root of 98181997 is about 9908.6829094487. The cubic root of 98181997 is about 461.3288559690.

The spelling of 98181997 in words is "ninety-eight million, one hundred eighty-one thousand, nine hundred ninety-seven".