19313897 has 2 divisors, whose sum is σ = 19313898. Its totient is φ = 19313896.

The previous prime is 19313873. The next prime is 19313929. The reversal of 19313897 is 79831391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18156121 + 1157776 = 4261^2 + 1076^2 .

It is an emirp because it is prime and its reverse (79831391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19313897 - 2⁸ = 19313641 is a prime.

It is not a weakly prime, because it can be changed into another prime (19313857) 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, 9656948 + 9656949.

It is an arithmetic number, because the mean of its divisors is an integer number (9656949).

Almost surely, 2^19313897 is an apocalyptic number.

It is an amenable number.

19313897 is a deficient number, since it is larger than the sum of its proper divisors (1).

19313897 is an equidigital number, since it uses as much as digits as its factorization.

19313897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 41.

The square root of 19313897 is about 4394.7579000441. The cubic root of 19313897 is about 268.3016253914.

The spelling of 19313897 in words is "nineteen million, three hundred thirteen thousand, eight hundred ninety-seven".