98513981 has 2 divisors, whose sum is σ = 98513982. Its totient is φ = 98513980.

The previous prime is 98513969. The next prime is 98514029. The reversal of 98513981 is 18931589.

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., 76282756 + 22231225 = 8734^2 + 4715^2 .

It is an emirp because it is prime and its reverse (18931589) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-98513981 is a prime.

It is a super-2 number, since 2×98513981² = 19410008904936722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98513911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49256990 + 49256991.

It is an arithmetic number, because the mean of its divisors is an integer number (49256991).

Almost surely, 2^98513981 is an apocalyptic number.

It is an amenable number.

98513981 is a deficient number, since it is larger than the sum of its proper divisors (1).

98513981 is an equidigital number, since it uses as much as digits as its factorization.

98513981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 44.

The square root of 98513981 is about 9925.4209482520. The cubic root of 98513981 is about 461.8482366663.

The spelling of 98513981 in words is "ninety-eight million, five hundred thirteen thousand, nine hundred eighty-one".