104206319981 has 2 divisors, whose sum is σ = 104206319982. Its totient is φ = 104206319980.

The previous prime is 104206319911. The next prime is 104206320011. The reversal of 104206319981 is 189913602401.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103912746025 + 293573956 = 322355^2 + 17134^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-104206319981 is a prime.

It is a super-2 number, since 2×104206319981² (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 (104206319911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52103159990 + 52103159991.

It is an arithmetic number, because the mean of its divisors is an integer number (52103159991).

Almost surely, 2^104206319981 is an apocalyptic number.

It is an amenable number.

104206319981 is a deficient number, since it is larger than the sum of its proper divisors (1).

104206319981 is an equidigital number, since it uses as much as digits as its factorization.

104206319981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 44.

The spelling of 104206319981 in words is "one hundred four billion, two hundred six million, three hundred nineteen thousand, nine hundred eighty-one".