851597 has 2 divisors, whose sum is σ = 851598. Its totient is φ = 851596.

The previous prime is 851573. The next prime is 851603. The reversal of 851597 is 795158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 434281 + 417316 = 659^2 + 646^2 .

It is a cyclic number.

It is not a de Polignac number, because 851597 - 2¹⁴ = 835213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (851507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425798 + 425799.

It is an arithmetic number, because the mean of its divisors is an integer number (425799).

2⁸⁵¹⁵⁹⁷ is an apocalyptic number.

It is an amenable number.

851597 is a deficient number, since it is larger than the sum of its proper divisors (1).

851597 is an equidigital number, since it uses as much as digits as its factorization.

851597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12600, while the sum is 35.

The square root of 851597 is about 922.8201341540. The cubic root of 851597 is about 94.7861115987.

The spelling of 851597 in words is "eight hundred fifty-one thousand, five hundred ninety-seven".