1891960655 has 16 divisors (see below), whose sum is σ = 2501859360. Its totient is φ = 1364646528.

The previous prime is 1891960649. The next prime is 1891960661. The reversal of 1891960655 is 5560691981.

It is an interprime number because it is at equal distance from previous prime (1891960649) and next prime (1891960661).

It is a cyclic number.

It is not a de Polignac number, because 1891960655 - 2⁴ = 1891960639 is a prime.

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, 335660 + ... + 341249.

It is an arithmetic number, because the mean of its divisors is an integer number (156366210).

Almost surely, 2^1891960655 is an apocalyptic number.

1891960655 is a deficient number, since it is larger than the sum of its proper divisors (609898705).

1891960655 is a wasteful number, since it uses less digits than its factorization.

1891960655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676970.

The product of its (nonzero) digits is 583200, while the sum is 50.

The square root of 1891960655 is about 43496.6740682549. The cubic root of 1891960655 is about 1236.8129775655.

The spelling of 1891960655 in words is "one billion, eight hundred ninety-one million, nine hundred sixty thousand, six hundred fifty-five".