861043 has 2 divisors, whose sum is σ = 861044. Its totient is φ = 861042.

The previous prime is 861037. The next prime is 861053. The reversal of 861043 is 340168.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861043 - 2¹³ = 852851 is a prime.

861043 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (861013) 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, 430521 + 430522.

It is an arithmetic number, because the mean of its divisors is an integer number (430522).

2⁸⁶¹⁰⁴³ is an apocalyptic number.

861043 is a deficient number, since it is larger than the sum of its proper divisors (1).

861043 is an equidigital number, since it uses as much as digits as its factorization.

861043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 861043 is about 927.9240270626. The cubic root of 861043 is about 95.1352827928.

It can be divided in two parts, 8610 and 43, that multiplied together give a triangular number (370230 = T₈₆₀).

The spelling of 861043 in words is "eight hundred sixty-one thousand, forty-three".