5631211980 has 144 divisors (see below), whose sum is σ = 17410358784. Its totient is φ = 1472929920.

The previous prime is 5631211979. The next prime is 5631211997. The reversal of 5631211980 is 891121365.

5631211980 is a `hidden beast` number, since 5 + 631 + 2 + 1 + 19 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3267399 + ... + 3269121.

Almost surely, 2^5631211980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5631211980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8705179392).

5631211980 is an abundant number, since it is smaller than the sum of its proper divisors (11779146804).

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

5631211980 is a wasteful number, since it uses less digits than its factorization.

5631211980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2076 (or 2071 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 5631211980 is about 75041.4017726215. The cubic root of 5631211980 is about 1779.1010884339.

The spelling of 5631211980 in words is "five billion, six hundred thirty-one million, two hundred eleven thousand, nine hundred eighty".