829439999981 has 2 divisors, whose sum is σ = 829439999982. Its totient is φ = 829439999980.

The previous prime is 829439999977. The next prime is 829440000001. The reversal of 829439999981 is 189999934928.

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., 829358097481 + 81902500 = 910691^2 + 9050^2 .

It is a cyclic number.

It is not a de Polignac number, because 829439999981 - 2² = 829439999977 is a prime.

It is a super-2 number, since 2×829439999981² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 829439999896 and 829439999905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (829439999081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 414719999990 + 414719999991.

It is an arithmetic number, because the mean of its divisors is an integer number (414719999991).

Almost surely, 2^829439999981 is an apocalyptic number.

It is an amenable number.

829439999981 is a deficient number, since it is larger than the sum of its proper divisors (1).

829439999981 is an equidigital number, since it uses as much as digits as its factorization.

829439999981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816293376, while the sum is 80.

The spelling of 829439999981 in words is "eight hundred twenty-nine billion, four hundred thirty-nine million, nine hundred ninety-nine thousand, nine hundred eighty-one".