851797 has 2 divisors, whose sum is σ = 851798. Its totient is φ = 851796.

The previous prime is 851761. The next prime is 851801. The reversal of 851797 is 797158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 531441 + 320356 = 729^2 + 566^2 .

It is a cyclic number.

It is not a de Polignac number, because 851797 - 2¹⁵ = 819029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (851197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425898 + 425899.

It is an arithmetic number, because the mean of its divisors is an integer number (425899).

2⁸⁵¹⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

851797 is a deficient number, since it is larger than the sum of its proper divisors (1).

851797 is an equidigital number, since it uses as much as digits as its factorization.

851797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 37.

The square root of 851797 is about 922.9284912711. The cubic root of 851797 is about 94.7935312813.

The spelling of 851797 in words is "eight hundred fifty-one thousand, seven hundred ninety-seven".