1989633941 has 2 divisors, whose sum is σ = 1989633942. Its totient is φ = 1989633940.

The previous prime is 1989633911. The next prime is 1989633959. The reversal of 1989633941 is 1493369891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1987822225 + 1811716 = 44585^2 + 1346^2 .

It is a cyclic number.

It is not a de Polignac number, because 1989633941 - 2¹⁴ = 1989617557 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1989633901) 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, 994816970 + 994816971.

It is an arithmetic number, because the mean of its divisors is an integer number (994816971).

Almost surely, 2^1989633941 is an apocalyptic number.

It is an amenable number.

1989633941 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989633941 is an equidigital number, since it uses as much as digits as its factorization.

1989633941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1259712, while the sum is 53.

The square root of 1989633941 is about 44605.3129234624. The cubic root of 1989633941 is about 1257.7405423432.

The spelling of 1989633941 in words is "one billion, nine hundred eighty-nine million, six hundred thirty-three thousand, nine hundred forty-one".