19912007 has 2 divisors, whose sum is σ = 19912008. Its totient is φ = 19912006.

The previous prime is 19912001. The next prime is 19912027. The reversal of 19912007 is 70021991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19912007 - 2¹⁰ = 19910983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19912001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9956003 + 9956004.

It is an arithmetic number, because the mean of its divisors is an integer number (9956004).

Almost surely, 2^19912007 is an apocalyptic number.

19912007 is a deficient number, since it is larger than the sum of its proper divisors (1).

19912007 is an equidigital number, since it uses as much as digits as its factorization.

19912007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 19912007 is about 4462.2871938054. The cubic root of 19912007 is about 271.0430935043.

Adding to 19912007 its reverse (70021991), we get a palindrome (89933998).

The spelling of 19912007 in words is "nineteen million, nine hundred twelve thousand, seven".