19009901 has 2 divisors, whose sum is σ = 19009902. Its totient is φ = 19009900.

The previous prime is 19009889. The next prime is 19009919. The reversal of 19009901 is 10990091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18913801 + 96100 = 4349^2 + 310^2 .

It is a cyclic number.

It is not a de Polignac number, because 19009901 - 2¹⁰ = 19008877 is a prime.

It is a super-2 number, since 2×19009901² = 722752672059602, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19009981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9504950 + 9504951.

It is an arithmetic number, because the mean of its divisors is an integer number (9504951).

Almost surely, 2^19009901 is an apocalyptic number.

It is an amenable number.

19009901 is a deficient number, since it is larger than the sum of its proper divisors (1).

19009901 is an equidigital number, since it uses as much as digits as its factorization.

19009901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729, while the sum is 29.

The square root of 19009901 is about 4360.0345182120. The cubic root of 19009901 is about 266.8865074281.

Adding to 19009901 its reverse (10990091), we get a palindrome (29999992).

The spelling of 19009901 in words is "nineteen million, nine thousand, nine hundred one".