19318973 has 2 divisors, whose sum is σ = 19318974. Its totient is φ = 19318972.

The previous prime is 19318967. The next prime is 19318979. The reversal of 19318973 is 37981391.

It is a balanced prime because it is at equal distance from previous prime (19318967) and next prime (19318979).

It can be written as a sum of positive squares in only one way, i.e., 12652249 + 6666724 = 3557^2 + 2582^2 .

It is a cyclic number.

It is not a de Polignac number, because 19318973 - 2¹² = 19314877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19318973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19318979) 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, 9659486 + 9659487.

It is an arithmetic number, because the mean of its divisors is an integer number (9659487).

Almost surely, 2^19318973 is an apocalyptic number.

It is an amenable number.

19318973 is a deficient number, since it is larger than the sum of its proper divisors (1).

19318973 is an equidigital number, since it uses as much as digits as its factorization.

19318973 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 19318973 is about 4395.3353683195. The cubic root of 19318973 is about 268.3251279806.

The spelling of 19318973 in words is "nineteen million, three hundred eighteen thousand, nine hundred seventy-three".