1909913893 has 2 divisors, whose sum is σ = 1909913894. Its totient is φ = 1909913892.

The previous prime is 1909913867. The next prime is 1909913899. The reversal of 1909913893 is 3983199091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1176695809 + 733218084 = 34303^2 + 27078^2 .

It is a cyclic number.

It is not a de Polignac number, because 1909913893 - 2⁵ = 1909913861 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1909913893.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1909913899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 954956946 + 954956947.

It is an arithmetic number, because the mean of its divisors is an integer number (954956947).

Almost surely, 2^1909913893 is an apocalyptic number.

It is an amenable number.

1909913893 is a deficient number, since it is larger than the sum of its proper divisors (1).

1909913893 is an equidigital number, since it uses as much as digits as its factorization.

1909913893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 472392, while the sum is 52.

The square root of 1909913893 is about 43702.5616297260. The cubic root of 1909913893 is about 1240.7127997241.

The spelling of 1909913893 in words is "one billion, nine hundred nine million, nine hundred thirteen thousand, eight hundred ninety-three".