1992643841 has 2 divisors, whose sum is σ = 1992643842. Its totient is φ = 1992643840.

The previous prime is 1992643837. The next prime is 1992643879. The reversal of 1992643841 is 1483462991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1984257025 + 8386816 = 44545^2 + 2896^2 .

It is a cyclic number.

It is not a de Polignac number, because 1992643841 - 2² = 1992643837 is a prime.

It is not a weakly prime, because it can be changed into another prime (1992343841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 996321920 + 996321921.

It is an arithmetic number, because the mean of its divisors is an integer number (996321921).

Almost surely, 2^1992643841 is an apocalyptic number.

It is an amenable number.

1992643841 is a deficient number, since it is larger than the sum of its proper divisors (1).

1992643841 is an equidigital number, since it uses as much as digits as its factorization.

1992643841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 47.

The square root of 1992643841 is about 44639.0394273891. The cubic root of 1992643841 is about 1258.3744555815.

The spelling of 1992643841 in words is "one billion, nine hundred ninety-two million, six hundred forty-three thousand, eight hundred forty-one".