1745328989981 has 2 divisors, whose sum is σ = 1745328989982. Its totient is φ = 1745328989980.

The previous prime is 1745328989947. The next prime is 1745328989993. The reversal of 1745328989981 is 1899898235471.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1745328989881 + 100 = 1321109^2 + 10^2 .

It is a cyclic number.

It is not a de Polignac number, because 1745328989981 - 2²⁶ = 1745261881117 is a prime.

It is a super-2 number, since 2×1745328989981² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1745328989899 and 1745328989908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1745328980981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 872664494990 + 872664494991.

It is an arithmetic number, because the mean of its divisors is an integer number (872664494991).

Almost surely, 2^{1745328989981} is an apocalyptic number.

It is an amenable number.

1745328989981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1745328989981 is an equidigital number, since it uses as much as digits as its factorization.

1745328989981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 313528320, while the sum is 74.

The spelling of 1745328989981 in words is "one trillion, seven hundred forty-five billion, three hundred twenty-eight million, nine hundred eighty-nine thousand, nine hundred eighty-one".