19009239901 has 2 divisors, whose sum is σ = 19009239902. Its totient is φ = 19009239900.

The previous prime is 19009239869. The next prime is 19009239919. The reversal of 19009239901 is 10993290091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19009239876 + 25 = 137874^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 19009239901 - 2⁵ = 19009239869 is a prime.

It is a super-2 number, since 2×19009239901² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19009239001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9504619950 + 9504619951.

It is an arithmetic number, because the mean of its divisors is an integer number (9504619951).

Almost surely, 2^19009239901 is an apocalyptic number.

It is an amenable number.

19009239901 is a deficient number, since it is larger than the sum of its proper divisors (1).

19009239901 is an equidigital number, since it uses as much as digits as its factorization.

19009239901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39366, while the sum is 43.

The spelling of 19009239901 in words is "nineteen billion, nine million, two hundred thirty-nine thousand, nine hundred one".