1231859 has 2 divisors, whose sum is σ = 1231860. Its totient is φ = 1231858.

The previous prime is 1231843. The next prime is 1231873. The reversal of 1231859 is 9581321.

It is a strong prime.

It is an emirp because it is prime and its reverse (9581321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231859 - 2⁴ = 1231843 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1231829) 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, 615929 + 615930.

It is an arithmetic number, because the mean of its divisors is an integer number (615930).

2^1231859 is an apocalyptic number.

1231859 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231859 is an equidigital number, since it uses as much as digits as its factorization.

1231859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 29.

The square root of 1231859 is about 1109.8914361324. The cubic root of 1231859 is about 107.1980783702.

The spelling of 1231859 in words is "one million, two hundred thirty-one thousand, eight hundred fifty-nine".