1020871 has 4 divisors (see below), whose sum is σ = 1027152. Its totient is φ = 1014592.

The previous prime is 1020853. The next prime is 1020881. The reversal of 1020871 is 1780201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1020871 - 2⁵ = 1020839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020821) 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 in 3 ways as a sum of consecutive naturals, for example, 2890 + ... + 3223.

It is an arithmetic number, because the mean of its divisors is an integer number (256788).

2^1020871 is an apocalyptic number.

1020871 is a deficient number, since it is larger than the sum of its proper divisors (6281).

1020871 is an equidigital number, since it uses as much as digits as its factorization.

1020871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6280.

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 1020871 is about 1010.3816110757. The cubic root of 1020871 is about 100.6909153656.

It can be divided in two parts, 1020 and 871, that added together give a triangular number (1891 = T₆₁).

The spelling of 1020871 in words is "one million, twenty thousand, eight hundred seventy-one".