19009239869 has 2 divisors, whose sum is σ = 19009239870. Its totient is φ = 19009239868.

The previous prime is 19009239797. The next prime is 19009239901. The reversal of 19009239869 is 96893290091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18844425625 + 164814244 = 137275^2 + 12838^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19009239869 is a prime.

It is a super-2 number, since 2×19009239869² (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 (19009239169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9504619934 + 9504619935.

It is an arithmetic number, because the mean of its divisors is an integer number (9504619935).

Almost surely, 2^19009239869 is an apocalyptic number.

It is an amenable number.

19009239869 is a deficient number, since it is larger than the sum of its proper divisors (1).

19009239869 is an equidigital number, since it uses as much as digits as its factorization.

19009239869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1889568, while the sum is 56.

The spelling of 19009239869 in words is "nineteen billion, nine million, two hundred thirty-nine thousand, eight hundred sixty-nine".