1821061 has 4 divisors (see below), whose sum is σ = 1986624. Its totient is φ = 1655500.

The previous prime is 1821037. The next prime is 1821067. The reversal of 1821061 is 1601281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1821061 - 2⁹ = 1820549 is a prime.

It is a Duffinian number.

1821061 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821067) by changing a digit.

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, 82765 + ... + 82786.

It is an arithmetic number, because the mean of its divisors is an integer number (496656).

2^1821061 is an apocalyptic number.

1821061 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1821061 is the 604-th centered decagonal number.

It is an amenable number.

1821061 is a deficient number, since it is larger than the sum of its proper divisors (165563).

1821061 is a wasteful number, since it uses less digits than its factorization.

1821061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165562.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 1821061 is about 1349.4669317920. The cubic root of 1821061 is about 122.1166357473.

The spelling of 1821061 in words is "one million, eight hundred twenty-one thousand, sixty-one".