19999069 has 2 divisors, whose sum is σ = 19999070. Its totient is φ = 19999068.

The previous prime is 19999027. The next prime is 19999117. The reversal of 19999069 is 96099991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17556100 + 2442969 = 4190^2 + 1563^2 .

It is a cyclic number.

It is not a de Polignac number, because 19999069 - 2¹⁹ = 19474781 is a prime.

It is a super-2 number, since 2×19999069² = 799925521733522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19999019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9999534 + 9999535.

It is an arithmetic number, because the mean of its divisors is an integer number (9999535).

Almost surely, 2^19999069 is an apocalyptic number.

It is an amenable number.

19999069 is a deficient number, since it is larger than the sum of its proper divisors (1).

19999069 is an equidigital number, since it uses as much as digits as its factorization.

19999069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 354294, while the sum is 52.

The square root of 19999069 is about 4472.0318648239. The cubic root of 19999069 is about 271.4375497228.

The spelling of 19999069 in words is "nineteen million, nine hundred ninety-nine thousand, sixty-nine".