19875913 has 2 divisors, whose sum is σ = 19875914. Its totient is φ = 19875912.

The previous prime is 19875871. The next prime is 19875949. The reversal of 19875913 is 31957891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19642624 + 233289 = 4432^2 + 483^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19875913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19875913.

It is not a weakly prime, because it can be changed into another prime (19875613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9937956 + 9937957.

It is an arithmetic number, because the mean of its divisors is an integer number (9937957).

Almost surely, 2^19875913 is an apocalyptic number.

It is an amenable number.

19875913 is a deficient number, since it is larger than the sum of its proper divisors (1).

19875913 is an equidigital number, since it uses as much as digits as its factorization.

19875913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 43.

The square root of 19875913 is about 4458.2410208512. The cubic root of 19875913 is about 270.8792234245.

The spelling of 19875913 in words is "nineteen million, eight hundred seventy-five thousand, nine hundred thirteen".