98817581 has 2 divisors, whose sum is σ = 98817582. Its totient is φ = 98817580.

The previous prime is 98817577. The next prime is 98817611. The reversal of 98817581 is 18571889.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98684356 + 133225 = 9934^2 + 365^2 .

It is a cyclic number.

It is not a de Polignac number, because 98817581 - 2² = 98817577 is a prime.

It is a super-2 number, since 2×98817581² = 19529828629383122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98810581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49408790 + 49408791.

It is an arithmetic number, because the mean of its divisors is an integer number (49408791).

Almost surely, 2^98817581 is an apocalyptic number.

It is an amenable number.

98817581 is a deficient number, since it is larger than the sum of its proper divisors (1).

98817581 is an equidigital number, since it uses as much as digits as its factorization.

98817581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 47.

The square root of 98817581 is about 9940.7032447408. The cubic root of 98817581 is about 462.3221908169.

The spelling of 98817581 in words is "ninety-eight million, eight hundred seventeen thousand, five hundred eighty-one".