2158885689 has 4 divisors (see below), whose sum is σ = 2878514256. Its totient is φ = 1439257124.

The previous prime is 2158885637. The next prime is 2158885717. The reversal of 2158885689 is 9865888512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2158885689 - 2²⁷ = 2024667961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2158885789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359814279 + ... + 359814284.

It is an arithmetic number, because the mean of its divisors is an integer number (719628564).

Almost surely, 2^2158885689 is an apocalyptic number.

It is an amenable number.

2158885689 is a deficient number, since it is larger than the sum of its proper divisors (719628567).

2158885689 is an equidigital number, since it uses as much as digits as its factorization.

2158885689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719628566.

The product of its digits is 11059200, while the sum is 60.

The square root of 2158885689 is about 46463.8105303472. The cubic root of 2158885689 is about 1292.4384877949.

The spelling of 2158885689 in words is "two billion, one hundred fifty-eight million, eight hundred eighty-five thousand, six hundred eighty-nine".