131022444 has 96 divisors (see below), whose sum is σ = 369976320. Its totient is φ = 35278848.

The previous prime is 131022443. The next prime is 131022473. The reversal of 131022444 is 444220131.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 131022444.

It is not an unprimeable number, because it can be changed into a prime (131022443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140572 + ... + 141500.

It is an arithmetic number, because the mean of its divisors is an integer number (3853920).

Almost surely, 2^131022444 is an apocalyptic number.

131022444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131022444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184988160).

131022444 is an abundant number, since it is smaller than the sum of its proper divisors (238953876).

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

131022444 is a wasteful number, since it uses less digits than its factorization.

131022444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039 (or 1037 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 131022444 is about 11446.5035709600. The cubic root of 131022444 is about 507.9043106186.

Adding to 131022444 its reverse (444220131), we get a palindrome (575242575).

The spelling of 131022444 in words is "one hundred thirty-one million, twenty-two thousand, four hundred forty-four".