855731 has 2 divisors, whose sum is σ = 855732. Its totient is φ = 855730.

The previous prime is 855727. The next prime is 855733. The reversal of 855731 is 137558.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 855731 - 2² = 855727 is a prime.

It is a super-2 number, since 2×855731² = 1464551088722, which contains 22 as substring.

Together with 855733, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 855694 and 855703.

It is not a weakly prime, because it can be changed into another prime (855733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427865 + 427866.

It is an arithmetic number, because the mean of its divisors is an integer number (427866).

2⁸⁵⁵⁷³¹ is an apocalyptic number.

855731 is a deficient number, since it is larger than the sum of its proper divisors (1).

855731 is an equidigital number, since it uses as much as digits as its factorization.

855731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4200, while the sum is 29.

The square root of 855731 is about 925.0572955228. The cubic root of 855731 is about 94.9392409270.

The spelling of 855731 in words is "eight hundred fifty-five thousand, seven hundred thirty-one".