1992542821 has 2 divisors, whose sum is σ = 1992542822. Its totient is φ = 1992542820.

The previous prime is 1992542801. The next prime is 1992542837. The reversal of 1992542821 is 1282452991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1504353796 + 488189025 = 38786^2 + 22095^2 .

It is a cyclic number.

It is not a de Polignac number, because 1992542821 - 2⁵ = 1992542789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1992542801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 996271410 + 996271411.

It is an arithmetic number, because the mean of its divisors is an integer number (996271411).

Almost surely, 2^1992542821 is an apocalyptic number.

It is an amenable number.

1992542821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1992542821 is an equidigital number, since it uses as much as digits as its factorization.

1992542821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 43.

The square root of 1992542821 is about 44637.9078922837. The cubic root of 1992542821 is about 1258.3531901763.

The spelling of 1992542821 in words is "one billion, nine hundred ninety-two million, five hundred forty-two thousand, eight hundred twenty-one".