891381055 has 16 divisors (see below), whose sum is σ = 1090799424. Its totient is φ = 699148800.

The previous prime is 891381053. The next prime is 891381079. The reversal of 891381055 is 550183198.

It is not a de Polignac number, because 891381055 - 2¹ = 891381053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 891380999 and 891381017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891381053) 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, 43447 + ... + 60583.

It is an arithmetic number, because the mean of its divisors is an integer number (68174964).

Almost surely, 2^891381055 is an apocalyptic number.

891381055 is a deficient number, since it is larger than the sum of its proper divisors (199418369).

891381055 is a wasteful number, since it uses less digits than its factorization.

891381055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17346.

The product of its (nonzero) digits is 43200, while the sum is 40.

The square root of 891381055 is about 29856.0053423093. The cubic root of 891381055 is about 962.3974564393.

The spelling of 891381055 in words is "eight hundred ninety-one million, three hundred eighty-one thousand, fifty-five".