851659 has 2 divisors, whose sum is σ = 851660. Its totient is φ = 851658.

The previous prime is 851647. The next prime is 851671. The reversal of 851659 is 956158.

It is a balanced prime because it is at equal distance from previous prime (851647) and next prime (851671).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-851659 is a prime.

It is not a weakly prime, because it can be changed into another prime (851639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425829 + 425830.

It is an arithmetic number, because the mean of its divisors is an integer number (425830).

2⁸⁵¹⁶⁵⁹ is an apocalyptic number.

851659 is a deficient number, since it is larger than the sum of its proper divisors (1).

851659 is an equidigital number, since it uses as much as digits as its factorization.

851659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 34.

The square root of 851659 is about 922.8537262210. The cubic root of 851659 is about 94.7884118245.

The spelling of 851659 in words is "eight hundred fifty-one thousand, six hundred fifty-nine".