835661 has 2 divisors, whose sum is σ = 835662. Its totient is φ = 835660.

The previous prime is 835643. The next prime is 835663. The reversal of 835661 is 166538.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 481636 + 354025 = 694^2 + 595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-835661 is a prime.

Together with 835663, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (835663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 417830 + 417831.

It is an arithmetic number, because the mean of its divisors is an integer number (417831).

2⁸³⁵⁶⁶¹ is an apocalyptic number.

It is an amenable number.

835661 is a deficient number, since it is larger than the sum of its proper divisors (1).

835661 is an equidigital number, since it uses as much as digits as its factorization.

835661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 835661 is about 914.1449556826. The cubic root of 835661 is about 94.1911381653.

The spelling of 835661 in words is "eight hundred thirty-five thousand, six hundred sixty-one".