1821311652 has 48 divisors (see below), whose sum is σ = 4540202240. Its totient is φ = 566561952.

The previous prime is 1821311647. The next prime is 1821311683. The reversal of 1821311652 is 2561131281.

It is a super-2 number, since 2×1821311652² = 6634352267421938208, which contains 22 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 44338 + ... + 74889.

Almost surely, 2^1821311652 is an apocalyptic number.

1821311652 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1821311652 is an abundant number, since it is smaller than the sum of its proper divisors (2718890588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1821311652 is a wasteful number, since it uses less digits than its factorization.

1821311652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119320 (or 119318 counting only the distinct ones).

The product of its digits is 2880, while the sum is 30.

The square root of 1821311652 is about 42676.8280452050. The cubic root of 1821311652 is about 1221.2223822749. Note that the first 3 decimals are identical.

The spelling of 1821311652 in words is "one billion, eight hundred twenty-one million, three hundred eleven thousand, six hundred fifty-two".