199992493 has 2 divisors, whose sum is σ = 199992494. Its totient is φ = 199992492.

The previous prime is 199992487. The next prime is 199992509. The reversal of 199992493 is 394299991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144072009 + 55920484 = 12003^2 + 7478^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199992493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199992433) 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, 99996246 + 99996247.

It is an arithmetic number, because the mean of its divisors is an integer number (99996247).

Almost surely, 2^199992493 is an apocalyptic number.

It is an amenable number.

199992493 is a deficient number, since it is larger than the sum of its proper divisors (1).

199992493 is an equidigital number, since it uses as much as digits as its factorization.

199992493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1417176, while the sum is 55.

The square root of 199992493 is about 14141.8702087100. The cubic root of 199992493 is about 584.7962306840.

The spelling of 199992493 in words is "one hundred ninety-nine million, nine hundred ninety-two thousand, four hundred ninety-three".