1916081605 has 16 divisors (see below), whose sum is σ = 2324640384. Its totient is φ = 1516004800.

The previous prime is 1916081569. The next prime is 1916081617. The reversal of 1916081605 is 5061806191.

It is not a de Polignac number, because 1916081605 - 2⁹ = 1916081093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 658584 + ... + 661486.

It is an arithmetic number, because the mean of its divisors is an integer number (145290024).

Almost surely, 2^1916081605 is an apocalyptic number.

It is an amenable number.

1916081605 is a deficient number, since it is larger than the sum of its proper divisors (408558779).

1916081605 is a wasteful number, since it uses less digits than its factorization.

1916081605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4316.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 1916081605 is about 43773.0694034586. The cubic root of 1916081605 is about 1242.0469151359.

Adding to 1916081605 its reverse (5061806191), we get a palindrome (6977887796).

The spelling of 1916081605 in words is "one billion, nine hundred sixteen million, eighty-one thousand, six hundred five".