890881 has 2 divisors, whose sum is σ = 890882. Its totient is φ = 890880.

The previous prime is 890867. The next prime is 890887. The reversal of 890881 is 188098.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 512656 + 378225 = 716^2 + 615^2 .

It is a cyclic number.

It is not a de Polignac number, because 890881 - 2¹⁵ = 858113 is a prime.

It is a super-2 number, since 2×890881² = 1587337912322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (890887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445440 + 445441.

It is an arithmetic number, because the mean of its divisors is an integer number (445441).

It is a Proth number, since it is equal to 435 ⋅ 2¹¹ + 1 and 435 < 2¹¹.

2⁸⁹⁰⁸⁸¹ is an apocalyptic number.

It is an amenable number.

890881 is a deficient number, since it is larger than the sum of its proper divisors (1).

890881 is an equidigital number, since it uses as much as digits as its factorization.

890881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 890881 is about 943.8649267771. The cubic root of 890881 is about 96.2217457969.

It can be divided in two parts, 890 and 881, that added together give a palindrome (1771).

The spelling of 890881 in words is "eight hundred ninety thousand, eight hundred eighty-one".