1981980000029 has 2 divisors, whose sum is σ = 1981980000030. Its totient is φ = 1981980000028.

The previous prime is 1981980000001. The next prime is 1981980000037. The reversal of 1981980000029 is 9200000891891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1925669659225 + 56310340804 = 1387685^2 + 237298^2 .

It is an emirp because it is prime and its reverse (9200000891891) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1981980000029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1981980000089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990990000014 + 990990000015.

It is an arithmetic number, because the mean of its divisors is an integer number (990990000015).

Almost surely, 2^{1981980000029} is an apocalyptic number.

It is an amenable number.

1981980000029 is a deficient number, since it is larger than the sum of its proper divisors (1).

1981980000029 is an equidigital number, since it uses as much as digits as its factorization.

1981980000029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 47.

The spelling of 1981980000029 in words is "one trillion, nine hundred eighty-one billion, nine hundred eighty million, twenty-nine", and thus it is an aban number.