19938601 has 2 divisors, whose sum is σ = 19938602. Its totient is φ = 19938600.

The previous prime is 19938571. The next prime is 19938613. The reversal of 19938601 is 10683991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18498601 + 1440000 = 4301^2 + 1200^2 .

It is an emirp because it is prime and its reverse (10683991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19938601 - 2⁷ = 19938473 is a prime.

It is not a weakly prime, because it can be changed into another prime (19938661) 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, 9969300 + 9969301.

It is an arithmetic number, because the mean of its divisors is an integer number (9969301).

Almost surely, 2^19938601 is an apocalyptic number.

It is an amenable number.

19938601 is a deficient number, since it is larger than the sum of its proper divisors (1).

19938601 is an equidigital number, since it uses as much as digits as its factorization.

19938601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 19938601 is about 4465.2660615018. The cubic root of 19938601 is about 271.1637060474.

The spelling of 19938601 in words is "nineteen million, nine hundred thirty-eight thousand, six hundred one".