1821081622 has 32 divisors (see below), whose sum is σ = 2859585120. Its totient is φ = 868707840.

The previous prime is 1821081607. The next prime is 1821081623. The reversal of 1821081622 is 2261801281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821081623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2066622 + ... + 2067502.

It is an arithmetic number, because the mean of its divisors is an integer number (89362035).

Almost surely, 2^1821081622 is an apocalyptic number.

1821081622 is a deficient number, since it is larger than the sum of its proper divisors (1038503498).

1821081622 is a wasteful number, since it uses less digits than its factorization.

1821081622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 1821081622 is about 42674.1329378817. The cubic root of 1821081622 is about 1221.1709670194.

The spelling of 1821081622 in words is "one billion, eight hundred twenty-one million, eighty-one thousand, six hundred twenty-two".