19985051 has 2 divisors, whose sum is σ = 19985052. Its totient is φ = 19985050.

The previous prime is 19985033. The next prime is 19985071. The reversal of 19985051 is 15058991.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19985051 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 19984996 and 19985014.

It is not a weakly prime, because it can be changed into another prime (19985071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9992525 + 9992526.

It is an arithmetic number, because the mean of its divisors is an integer number (9992526).

Almost surely, 2^19985051 is an apocalyptic number.

19985051 is a deficient number, since it is larger than the sum of its proper divisors (1).

19985051 is an equidigital number, since it uses as much as digits as its factorization.

19985051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 38.

The square root of 19985051 is about 4470.4642935606. The cubic root of 19985051 is about 271.3741150876.

The spelling of 19985051 in words is "nineteen million, nine hundred eighty-five thousand, fifty-one".