891856001 has 4 divisors (see below), whose sum is σ = 897011412. Its totient is φ = 886700592.

The previous prime is 891855949. The next prime is 891856013. The reversal of 891856001 is 100658198.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 596531776 + 295324225 = 24424^2 + 17185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-891856001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (891856501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2577446 + ... + 2577791.

It is an arithmetic number, because the mean of its divisors is an integer number (224252853).

Almost surely, 2^891856001 is an apocalyptic number.

It is an amenable number.

891856001 is a deficient number, since it is larger than the sum of its proper divisors (5155411).

891856001 is a wasteful number, since it uses less digits than its factorization.

891856001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5155410.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 891856001 is about 29863.9582272679. The cubic root of 891856001 is about 962.5683544191.

The spelling of 891856001 in words is "eight hundred ninety-one million, eight hundred fifty-six thousand, one".