891058081 has 2 divisors, whose sum is σ = 891058082. Its totient is φ = 891058080.

The previous prime is 891058073. The next prime is 891058109. The reversal of 891058081 is 180850198.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 582739600 + 308318481 = 24140^2 + 17559^2 .

It is a cyclic number.

It is not a de Polignac number, because 891058081 - 2³ = 891058073 is a prime.

It is a super-2 number, since 2×891058081² = 1587969007430805122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (891058981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445529040 + 445529041.

It is an arithmetic number, because the mean of its divisors is an integer number (445529041).

Almost surely, 2^891058081 is an apocalyptic number.

It is an amenable number.

891058081 is a deficient number, since it is larger than the sum of its proper divisors (1).

891058081 is an equidigital number, since it uses as much as digits as its factorization.

891058081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 40.

The square root of 891058081 is about 29850.5959907001. The cubic root of 891058081 is about 962.2812072764.

The spelling of 891058081 in words is "eight hundred ninety-one million, fifty-eight thousand, eighty-one".