1913665189 has 6 divisors (see below), whose sum is σ = 1942658214. Its totient is φ = 1885098600.

The previous prime is 1913665153. The next prime is 1913665211. The reversal of 1913665189 is 9815663191.

It can be written as a sum of positive squares in only one way, i.e., 1902442689 + 11222500 = 43617^2 + 3350^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1913665189 is a prime.

It is a super-2 number, since 2×1913665189² = 7324228911180811442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1913665109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 208662 + ... + 217639.

It is an arithmetic number, because the mean of its divisors is an integer number (323776369).

Almost surely, 2^1913665189 is an apocalyptic number.

It is an amenable number.

1913665189 is a deficient number, since it is larger than the sum of its proper divisors (28993025).

1913665189 is an frugal number, since it uses more digits than its factorization.

1913665189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426435 (or 426368 counting only the distinct ones).

The product of its digits is 349920, while the sum is 49.

The square root of 1913665189 is about 43745.4590671992. The cubic root of 1913665189 is about 1241.5245705436.

The spelling of 1913665189 in words is "one billion, nine hundred thirteen million, six hundred sixty-five thousand, one hundred eighty-nine".