19943201 has 2 divisors, whose sum is σ = 19943202. Its totient is φ = 19943200.

The previous prime is 19943173. The next prime is 19943221. The reversal of 19943201 is 10234991.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18190225 + 1752976 = 4265^2 + 1324^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19943201 is a prime.

It is a super-2 number, since 2×19943201² = 795462532252802, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19943221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9971600 + 9971601.

It is an arithmetic number, because the mean of its divisors is an integer number (9971601).

Almost surely, 2^19943201 is an apocalyptic number.

It is an amenable number.

19943201 is a deficient number, since it is larger than the sum of its proper divisors (1).

19943201 is an equidigital number, since it uses as much as digits as its factorization.

19943201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 19943201 is about 4465.7811186846. The cubic root of 19943201 is about 271.1845576798.

The spelling of 19943201 in words is "nineteen million, nine hundred forty-three thousand, two hundred one".