1671655 has 4 divisors (see below), whose sum is σ = 2005992. Its totient is φ = 1337320.

The previous prime is 1671643. The next prime is 1671671. The reversal of 1671655 is 5561761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5561761 = 829 ⋅6709.

It is not a de Polignac number, because 1671655 - 2¹³ = 1663463 is a prime.

It is a Duffinian number.

1671655 is a lucky number.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 167161 + ... + 167170.

It is an arithmetic number, because the mean of its divisors is an integer number (501498).

2^1671655 is an apocalyptic number.

1671655 is a deficient number, since it is larger than the sum of its proper divisors (334337).

1671655 is an equidigital number, since it uses as much as digits as its factorization.

1671655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334336.

The product of its digits is 6300, while the sum is 31.

The square root of 1671655 is about 1292.9249784887. The cubic root of 1671655 is about 118.6812787979.

The spelling of 1671655 in words is "one million, six hundred seventy-one thousand, six hundred fifty-five".