19881983941 has 2 divisors, whose sum is σ = 19881983942. Its totient is φ = 19881983940.

The previous prime is 19881983897. The next prime is 19881983977. The reversal of 19881983941 is 14938918891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18352391841 + 1529592100 = 135471^2 + 39110^2 .

It is a cyclic number.

It is not a de Polignac number, because 19881983941 - 2⁷ = 19881983813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19881983941.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19881986941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9940991970 + 9940991971.

It is an arithmetic number, because the mean of its divisors is an integer number (9940991971).

Almost surely, 2^19881983941 is an apocalyptic number.

It is an amenable number.

19881983941 is a deficient number, since it is larger than the sum of its proper divisors (1).

19881983941 is an equidigital number, since it uses as much as digits as its factorization.

19881983941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4478976, while the sum is 61.

The spelling of 19881983941 in words is "nineteen billion, eight hundred eighty-one million, nine hundred eighty-three thousand, nine hundred forty-one".