1643121132 has 48 divisors (see below), whose sum is σ = 3955080192. Its totient is φ = 530671680.

The previous prime is 1643121131. The next prime is 1643121143. The reversal of 1643121132 is 2311213461.

It is a happy number.

It is a super-2 number, since 2×1643121132² = 5399694108849922848, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1643121131) 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, 32293 + ... + 65795.

It is an arithmetic number, because the mean of its divisors is an integer number (82397504).

Almost surely, 2^1643121132 is an apocalyptic number.

1643121132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1643121132 is an abundant number, since it is smaller than the sum of its proper divisors (2311959060).

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

1643121132 is a wasteful number, since it uses less digits than its factorization.

1643121132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33638 (or 33636 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

The square root of 1643121132 is about 40535.4305762255. The cubic root of 1643121132 is about 1180.0213373524.

Adding to 1643121132 its reverse (2311213461), we get a palindrome (3954334593).

The spelling of 1643121132 in words is "one billion, six hundred forty-three million, one hundred twenty-one thousand, one hundred thirty-two".