19611973 has 2 divisors, whose sum is σ = 19611974. Its totient is φ = 19611972.

The previous prime is 19611953. The next prime is 19611989. The reversal of 19611973 is 37911691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17489124 + 2122849 = 4182^2 + 1457^2 .

It is an emirp because it is prime and its reverse (37911691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19611973 - 2⁹ = 19611461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19611953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9805986 + 9805987.

It is an arithmetic number, because the mean of its divisors is an integer number (9805987).

Almost surely, 2^19611973 is an apocalyptic number.

It is an amenable number.

19611973 is a deficient number, since it is larger than the sum of its proper divisors (1).

19611973 is an equidigital number, since it uses as much as digits as its factorization.

19611973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 37.

The square root of 19611973 is about 4428.5407303083. The cubic root of 19611973 is about 269.6748394769.

The spelling of 19611973 in words is "nineteen million, six hundred eleven thousand, nine hundred seventy-three".