891533861 has 4 divisors (see below), whose sum is σ = 892137324. Its totient is φ = 890930400.

The previous prime is 891533857. The next prime is 891533891. The reversal of 891533861 is 168335198.

891533861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 495285025 + 396248836 = 22255^2 + 19906^2 .

It is a cyclic number.

It is not a de Polignac number, because 891533861 - 2² = 891533857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891533801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 299510 + ... + 302471.

It is an arithmetic number, because the mean of its divisors is an integer number (223034331).

Almost surely, 2^891533861 is an apocalyptic number.

It is an amenable number.

891533861 is a deficient number, since it is larger than the sum of its proper divisors (603463).

891533861 is a wasteful number, since it uses less digits than its factorization.

891533861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603462.

The product of its digits is 155520, while the sum is 44.

The square root of 891533861 is about 29858.5642822960. The cubic root of 891533861 is about 962.4524466527.

The spelling of 891533861 in words is "eight hundred ninety-one million, five hundred thirty-three thousand, eight hundred sixty-one".