1161644100 has 72 divisors (see below), whose sum is σ = 3375179808. Its totient is φ = 308467200.

The previous prime is 1161644087. The next prime is 1161644111. The reversal of 1161644100 is 14461611.

1161644100 is a nontrivial binomial coefficient, being equal to C(48201, 2).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64267 + ... + 80333.

Almost surely, 2^1161644100 is an apocalyptic number.

1161644100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1161644100 is the 48200-th triangular number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1161644100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1687589904).

1161644100 is an abundant number, since it is smaller than the sum of its proper divisors (2213535708).

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

1161644100 is a wasteful number, since it uses less digits than its factorization.

1161644100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16325 (or 16318 counting only the distinct ones).

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

The square root of 1161644100 is about 34082.9004047484. The cubic root of 1161644100 is about 1051.2137438287.

The spelling of 1161644100 in words is "one billion, one hundred sixty-one million, six hundred forty-four thousand, one hundred".