859381 has 2 divisors, whose sum is σ = 859382. Its totient is φ = 859380.

The previous prime is 859373. The next prime is 859393. The reversal of 859381 is 183958.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 707281 + 152100 = 841^2 + 390^2 .

It is a cyclic number.

It is not a de Polignac number, because 859381 - 2³ = 859373 is a prime.

It is a super-2 number, since 2×859381² = 1477071406322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (859321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429690 + 429691.

It is an arithmetic number, because the mean of its divisors is an integer number (429691).

2⁸⁵⁹³⁸¹ is an apocalyptic number.

It is an amenable number.

859381 is a deficient number, since it is larger than the sum of its proper divisors (1).

859381 is an equidigital number, since it uses as much as digits as its factorization.

859381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 34.

The square root of 859381 is about 927.0280470406. The cubic root of 859381 is about 95.0740327812.

The spelling of 859381 in words is "eight hundred fifty-nine thousand, three hundred eighty-one".