1992993721 has 2 divisors, whose sum is σ = 1992993722. Its totient is φ = 1992993720.

The previous prime is 1992993703. The next prime is 1992993731. The reversal of 1992993721 is 1273992991.

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., 1817828496 + 175165225 = 42636^2 + 13235^2 .

It is a cyclic number.

It is not a de Polignac number, because 1992993721 - 2⁹ = 1992993209 is a prime.

It is not a weakly prime, because it can be changed into another prime (1992993701) 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, 996496860 + 996496861.

It is an arithmetic number, because the mean of its divisors is an integer number (996496861).

Almost surely, 2^1992993721 is an apocalyptic number.

It is an amenable number.

1992993721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1992993721 is an equidigital number, since it uses as much as digits as its factorization.

1992993721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 551124, while the sum is 52.

The square root of 1992993721 is about 44642.9582465141. The cubic root of 1992993721 is about 1258.4481021742.

The spelling of 1992993721 in words is "one billion, nine hundred ninety-two million, nine hundred ninety-three thousand, seven hundred twenty-one".