881820581 has 2 divisors, whose sum is σ = 881820582. Its totient is φ = 881820580.

The previous prime is 881820553. The next prime is 881820649. The reversal of 881820581 is 185028188.

881820581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 881793025 + 27556 = 29695^2 + 166^2 .

It is a cyclic number.

It is not a de Polignac number, because 881820581 - 2¹⁴ = 881804197 is a prime.

It is a super-2 number, since 2×881820581² = 1555215074150355122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (881823581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 440910290 + 440910291.

It is an arithmetic number, because the mean of its divisors is an integer number (440910291).

Almost surely, 2^881820581 is an apocalyptic number.

It is an amenable number.

881820581 is a deficient number, since it is larger than the sum of its proper divisors (1).

881820581 is an equidigital number, since it uses as much as digits as its factorization.

881820581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40960, while the sum is 41.

The square root of 881820581 is about 29695.4639802108. The cubic root of 881820581 is about 958.9443622641.

The spelling of 881820581 in words is "eight hundred eighty-one million, eight hundred twenty thousand, five hundred eighty-one".