433661 has 2 divisors, whose sum is σ = 433662. Its totient is φ = 433660.

The previous prime is 433651. The next prime is 433663. The reversal of 433661 is 166334.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 337561 + 96100 = 581^2 + 310^2 .

It is a cyclic number.

It is not a de Polignac number, because 433661 - 2¹⁰ = 432637 is a prime.

Together with 433663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (433663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216830 + 216831.

It is an arithmetic number, because the mean of its divisors is an integer number (216831).

2⁴³³⁶⁶¹ is an apocalyptic number.

It is an amenable number.

433661 is a deficient number, since it is larger than the sum of its proper divisors (1).

433661 is an equidigital number, since it uses as much as digits as its factorization.

433661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 23.

The square root of 433661 is about 658.5294222736. The cubic root of 433661 is about 75.6920246818.

Adding to 433661 its reverse (166334), we get a palindrome (599995).

The spelling of 433661 in words is "four hundred thirty-three thousand, six hundred sixty-one".