19801373 has 2 divisors, whose sum is σ = 19801374. Its totient is φ = 19801372.

The previous prime is 19801351. The next prime is 19801387. The reversal of 19801373 is 37310891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13935289 + 5866084 = 3733^2 + 2422^2 .

It is an emirp because it is prime and its reverse (37310891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19801373 - 2¹⁰ = 19800349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19801673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9900686 + 9900687.

It is an arithmetic number, because the mean of its divisors is an integer number (9900687).

Almost surely, 2^19801373 is an apocalyptic number.

It is an amenable number.

19801373 is a deficient number, since it is larger than the sum of its proper divisors (1).

19801373 is an equidigital number, since it uses as much as digits as its factorization.

19801373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 19801373 is about 4449.8733689848. The cubic root of 19801373 is about 270.5401760054.

The spelling of 19801373 in words is "nineteen million, eight hundred one thousand, three hundred seventy-three".