899681 has 2 divisors, whose sum is σ = 899682. Its totient is φ = 899680.

The previous prime is 899671. The next prime is 899687. The reversal of 899681 is 186998.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 819025 + 80656 = 905^2 + 284^2 .

It is a cyclic number.

It is not a de Polignac number, because 899681 - 2⁶ = 899617 is a prime.

It is a super-2 number, since 2×899681² = 1618851803522, which contains 22 as substring.

It is a Chen prime.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (899687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 449840 + 449841.

It is an arithmetic number, because the mean of its divisors is an integer number (449841).

2⁸⁹⁹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

899681 is a deficient number, since it is larger than the sum of its proper divisors (1).

899681 is an equidigital number, since it uses as much as digits as its factorization.

899681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 41.

The square root of 899681 is about 948.5151553876. The cubic root of 899681 is about 96.5375300343.

The spelling of 899681 in words is "eight hundred ninety-nine thousand, six hundred eighty-one".