858997 has 2 divisors, whose sum is σ = 858998. Its totient is φ = 858996.

The previous prime is 858989. The next prime is 859003. The reversal of 858997 is 799858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 857476 + 1521 = 926^2 + 39^2 .

It is a cyclic number.

It is not a de Polignac number, because 858997 - 2³ = 858989 is a prime.

It is a Chen prime.

858997 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (858397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429498 + 429499.

It is an arithmetic number, because the mean of its divisors is an integer number (429499).

2⁸⁵⁸⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

858997 is a deficient number, since it is larger than the sum of its proper divisors (1).

858997 is an equidigital number, since it uses as much as digits as its factorization.

858997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 46.

The square root of 858997 is about 926.8209104244. The cubic root of 858997 is about 95.0598699254.

The spelling of 858997 in words is "eight hundred fifty-eight thousand, nine hundred ninety-seven".