19972201 has 2 divisors, whose sum is σ = 19972202. Its totient is φ = 19972200.

The previous prime is 19972181. The next prime is 19972259. The reversal of 19972201 is 10227991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10368400 + 9603801 = 3220^2 + 3099^2 .

It is an emirp because it is prime and its reverse (10227991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19972201 - 2¹⁵ = 19939433 is a prime.

It is not a weakly prime, because it can be changed into another prime (19972261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9986100 + 9986101.

It is an arithmetic number, because the mean of its divisors is an integer number (9986101).

Almost surely, 2^19972201 is an apocalyptic number.

It is an amenable number.

19972201 is a deficient number, since it is larger than the sum of its proper divisors (1).

19972201 is an equidigital number, since it uses as much as digits as its factorization.

19972201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 19972201 is about 4469.0268515640. The cubic root of 19972201 is about 271.3159398539.

The spelling of 19972201 in words is "nineteen million, nine hundred seventy-two thousand, two hundred one".