1655891 has 2 divisors, whose sum is σ = 1655892. Its totient is φ = 1655890.

The previous prime is 1655873. The next prime is 1655893. The reversal of 1655891 is 1985561.

1655891 is nontrivially palindromic in base 2.

It is a strong prime.

It is an emirp because it is prime and its reverse (1985561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1655891 - 2⁶ = 1655827 is a prime.

Together with 1655893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1655893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827945 + 827946.

It is an arithmetic number, because the mean of its divisors is an integer number (827946).

2^1655891 is an apocalyptic number.

1655891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655891 is an equidigital number, since it uses as much as digits as its factorization.

1655891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 35.

The square root of 1655891 is about 1286.8142834147. The cubic root of 1655891 is about 118.3070381742.

The spelling of 1655891 in words is "one million, six hundred fifty-five thousand, eight hundred ninety-one".