19972801 has 2 divisors, whose sum is σ = 19972802. Its totient is φ = 19972800.

The previous prime is 19972787. The next prime is 19972817. The reversal of 19972801 is 10827991.

It is the 1825-th star number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18147600 + 1825201 = 4260^2 + 1351^2 .

It is a cyclic number.

It is not a de Polignac number, because 19972801 - 2¹⁵ = 19940033 is a prime.

It is not a weakly prime, because it can be changed into another prime (19972831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9986400 + 9986401.

It is an arithmetic number, because the mean of its divisors is an integer number (9986401).

Almost surely, 2^19972801 is an apocalyptic number.

It is an amenable number.

19972801 is a deficient number, since it is larger than the sum of its proper divisors (1).

19972801 is an equidigital number, since it uses as much as digits as its factorization.

19972801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 19972801 is about 4469.0939797682. The cubic root of 19972801 is about 271.3186567625.

The spelling of 19972801 in words is "nineteen million, nine hundred seventy-two thousand, eight hundred one".