1101638220 has 48 divisors (see below), whose sum is σ = 3092705280. Its totient is φ = 292997056.

The previous prime is 1101638207. The next prime is 1101638249. The reversal of 1101638220 is 228361011.

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, 990 + ... + 46949.

It is an arithmetic number, because the mean of its divisors is an integer number (64431360).

Almost surely, 2^1101638220 is an apocalyptic number.

1101638220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1101638220 is an abundant number, since it is smaller than the sum of its proper divisors (1991067060).

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

1101638220 is a wasteful number, since it uses less digits than its factorization.

1101638220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48334 (or 48332 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 1101638220 is about 33190.9358108505. The cubic root of 1101638220 is about 1032.7923163989.

Adding to 1101638220 its reverse (228361011), we get a palindrome (1329999231).

The spelling of 1101638220 in words is "one billion, one hundred one million, six hundred thirty-eight thousand, two hundred twenty".