891958849 has 8 divisors (see below), whose sum is σ = 901477800. Its totient is φ = 882487296.

The previous prime is 891958841. The next prime is 891958853. The reversal of 891958849 is 948859198.

It can be written as a sum of positive squares in 4 ways, for example, as 35343025 + 856615824 = 5945^2 + 29268^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 891958849 - 2³ = 891958841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (891958841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26647 + ... + 49939.

It is an arithmetic number, because the mean of its divisors is an integer number (112684725).

Almost surely, 2^891958849 is an apocalyptic number.

It is an amenable number.

891958849 is a deficient number, since it is larger than the sum of its proper divisors (9518951).

891958849 is a wasteful number, since it uses less digits than its factorization.

891958849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23699.

The product of its digits is 7464960, while the sum is 61.

The square root of 891958849 is about 29865.6801194950. The cubic root of 891958849 is about 962.6053538244.

The spelling of 891958849 in words is "eight hundred ninety-one million, nine hundred fifty-eight thousand, eight hundred forty-nine".