858961 has 2 divisors, whose sum is σ = 858962. Its totient is φ = 858960.

The previous prime is 858953. The next prime is 858989. The reversal of 858961 is 169858.

858961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 844561 + 14400 = 919^2 + 120^2 .

It is a cyclic number.

It is not a de Polignac number, because 858961 - 2³ = 858953 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 858961.

It is not a weakly prime, because it can be changed into another prime (858911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429480 + 429481.

It is an arithmetic number, because the mean of its divisors is an integer number (429481).

2⁸⁵⁸⁹⁶¹ is an apocalyptic number.

It is an amenable number.

858961 is a deficient number, since it is larger than the sum of its proper divisors (1).

858961 is an equidigital number, since it uses as much as digits as its factorization.

858961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 37.

The square root of 858961 is about 926.8014889932. The cubic root of 858961 is about 95.0585419412.

The spelling of 858961 in words is "eight hundred fifty-eight thousand, nine hundred sixty-one".