19955801 has 2 divisors, whose sum is σ = 19955802. Its totient is φ = 19955800.

The previous prime is 19955779. The next prime is 19955809. The reversal of 19955801 is 10855991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19811401 + 144400 = 4451^2 + 380^2 .

It is a cyclic number.

It is not a de Polignac number, because 19955801 - 2⁶ = 19955737 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19955809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9977900 + 9977901.

It is an arithmetic number, because the mean of its divisors is an integer number (9977901).

Almost surely, 2^19955801 is an apocalyptic number.

It is an amenable number.

19955801 is a deficient number, since it is larger than the sum of its proper divisors (1).

19955801 is an equidigital number, since it uses as much as digits as its factorization.

19955801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 38.

The square root of 19955801 is about 4467.1916233804. The cubic root of 19955801 is about 271.2416566059.

The spelling of 19955801 in words is "nineteen million, nine hundred fifty-five thousand, eight hundred one".