9494690399981 has 2 divisors, whose sum is σ = 9494690399982. Its totient is φ = 9494690399980.

The previous prime is 9494690399969. The next prime is 9494690400079. The reversal of 9494690399981 is 1899930964949.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7801178577481 + 1693511822500 = 2793059^2 + 1301350^2 .

It is a cyclic number.

It is not a de Polignac number, because 9494690399981 - 2²² = 9494686205677 is a prime.

It is a super-2 number, since 2×9494690399981² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9494690399896 and 9494690399905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9494690399921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4747345199990 + 4747345199991.

It is an arithmetic number, because the mean of its divisors is an integer number (4747345199991).

Almost surely, 2^{9494690399981} is an apocalyptic number.

It is an amenable number.

9494690399981 is a deficient number, since it is larger than the sum of its proper divisors (1).

9494690399981 is an equidigital number, since it uses as much as digits as its factorization.

9494690399981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1224440064, while the sum is 80.

The spelling of 9494690399981 in words is "nine trillion, four hundred ninety-four billion, six hundred ninety million, three hundred ninety-nine thousand, nine hundred eighty-one".