19201601 has 2 divisors, whose sum is σ = 19201602. Its totient is φ = 19201600.

The previous prime is 19201591. The next prime is 19201603. The reversal of 19201601 is 10610291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18931201 + 270400 = 4351^2 + 520^2 .

It is a cyclic number.

It is not a de Polignac number, because 19201601 - 2¹⁴ = 19185217 is a prime.

Together with 19201603, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1223057 and since 19201601 and 1223057 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (19201603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9600800 + 9600801.

It is an arithmetic number, because the mean of its divisors is an integer number (9600801).

Almost surely, 2^19201601 is an apocalyptic number.

It is an amenable number.

19201601 is a deficient number, since it is larger than the sum of its proper divisors (1).

19201601 is an equidigital number, since it uses as much as digits as its factorization.

19201601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 19201601 is about 4381.9631445278. The cubic root of 19201601 is about 267.7806226187.

Adding to 19201601 its reverse (10610291), we get a palindrome (29811892).

The spelling of 19201601 in words is "nineteen million, two hundred one thousand, six hundred one".