433681 has 2 divisors, whose sum is σ = 433682. Its totient is φ = 433680.

The previous prime is 433679. The next prime is 433703. The reversal of 433681 is 186334.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 286225 + 147456 = 535^2 + 384^2 .

It is a cyclic number.

It is not a de Polignac number, because 433681 - 2¹ = 433679 is a prime.

It is a super-2 number, since 2×433681² = 376158419522, which contains 22 as substring.

Together with 433679, it forms a pair of twin primes.

It is a nialpdrome in base 15.

It is not a weakly prime, because it can be changed into another prime (433651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216840 + 216841.

It is an arithmetic number, because the mean of its divisors is an integer number (216841).

2⁴³³⁶⁸¹ is an apocalyptic number.

433681 is the 417-th centered pentagonal number.

It is an amenable number.

433681 is a deficient number, since it is larger than the sum of its proper divisors (1).

433681 is an equidigital number, since it uses as much as digits as its factorization.

433681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 25.

The square root of 433681 is about 658.5446074489. The cubic root of 433681 is about 75.6931882767.

The spelling of 433681 in words is "four hundred thirty-three thousand, six hundred eighty-one".