19181403869 has 2 divisors, whose sum is σ = 19181403870. Its totient is φ = 19181403868.

The previous prime is 19181403859. The next prime is 19181403907. The reversal of 19181403869 is 96830418191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19179480100 + 1923769 = 138490^2 + 1387^2 .

It is a cyclic number.

It is not a de Polignac number, because 19181403869 - 2¹⁶ = 19181338333 is a prime.

It is a super-2 number, since 2×19181403869² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19181403809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9590701934 + 9590701935.

It is an arithmetic number, because the mean of its divisors is an integer number (9590701935).

Almost surely, 2^19181403869 is an apocalyptic number.

It is an amenable number.

19181403869 is a deficient number, since it is larger than the sum of its proper divisors (1).

19181403869 is an equidigital number, since it uses as much as digits as its factorization.

19181403869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 50.

The spelling of 19181403869 in words is "nineteen billion, one hundred eighty-one million, four hundred three thousand, eight hundred sixty-nine".