840061 has 2 divisors, whose sum is σ = 840062. Its totient is φ = 840060.

The previous prime is 840053. The next prime is 840067. The reversal of 840061 is 160048.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 792100 + 47961 = 890^2 + 219^2 .

It is a cyclic number.

It is not a de Polignac number, because 840061 - 2³ = 840053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420030 + 420031.

It is an arithmetic number, because the mean of its divisors is an integer number (420031).

2⁸⁴⁰⁰⁶¹ is an apocalyptic number.

It is an amenable number.

840061 is a deficient number, since it is larger than the sum of its proper divisors (1).

840061 is an equidigital number, since it uses as much as digits as its factorization.

840061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 840061 is about 916.5484166153. The cubic root of 840061 is about 94.3561635140.

The spelling of 840061 in words is "eight hundred forty thousand, sixty-one".