1235891 has 2 divisors, whose sum is σ = 1235892. Its totient is φ = 1235890.

The previous prime is 1235887. The next prime is 1235909. The reversal of 1235891 is 1985321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1235891 - 2² = 1235887 is a prime.

It is not a weakly prime, because it can be changed into another prime (1235821) 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, 617945 + 617946.

It is an arithmetic number, because the mean of its divisors is an integer number (617946).

2^1235891 is an apocalyptic number.

1235891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1235891 is an equidigital number, since it uses as much as digits as its factorization.

1235891 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 1235891 is about 1111.7063461184. The cubic root of 1235891 is about 107.3149077416.

The spelling of 1235891 in words is "one million, two hundred thirty-five thousand, eight hundred ninety-one".