891438555 has 16 divisors (see below), whose sum is σ = 1630059264. Its totient is φ = 407514720.

The previous prime is 891438539. The next prime is 891438557. The reversal of 891438555 is 555834198.

It is a happy number.

891438555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 891438555 - 2⁴ = 891438539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (891438557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4244841 + ... + 4245050.

It is an arithmetic number, because the mean of its divisors is an integer number (101878704).

Almost surely, 2^891438555 is an apocalyptic number.

891438555 is a deficient number, since it is larger than the sum of its proper divisors (738620709).

891438555 is a wasteful number, since it uses less digits than its factorization.

891438555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8489906.

The product of its digits is 864000, while the sum is 48.

The square root of 891438555 is about 29856.9682821280. The cubic root of 891438555 is about 962.4181496709.

The spelling of 891438555 in words is "eight hundred ninety-one million, four hundred thirty-eight thousand, five hundred fifty-five".