98440023581 has 2 divisors, whose sum is σ = 98440023582. Its totient is φ = 98440023580.

The previous prime is 98440023533. The next prime is 98440023629. The reversal of 98440023581 is 18532004489.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (98440023533) and next prime (98440023629).

It can be written as a sum of positive squares in only one way, i.e., 75166995556 + 23273028025 = 274166^2 + 152555^2 .

It is a cyclic number.

It is not a de Polignac number, because 98440023581 - 2²² = 98435829277 is a prime.

It is a super-2 number, since 2×98440023581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98440023181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49220011790 + 49220011791.

It is an arithmetic number, because the mean of its divisors is an integer number (49220011791).

Almost surely, 2^98440023581 is an apocalyptic number.

It is an amenable number.

98440023581 is a deficient number, since it is larger than the sum of its proper divisors (1).

98440023581 is an equidigital number, since it uses as much as digits as its factorization.

98440023581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 276480, while the sum is 44.

The spelling of 98440023581 in words is "ninety-eight billion, four hundred forty million, twenty-three thousand, five hundred eighty-one".