131320644 has 96 divisors (see below), whose sum is σ = 384410880. Its totient is φ = 33965568.

The previous prime is 131320633. The next prime is 131320669. The reversal of 131320644 is 446023131.

It is a super-2 number, since 2×131320644² = 34490223081149472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56742 + ... + 59010.

It is an arithmetic number, because the mean of its divisors is an integer number (4004280).

Almost surely, 2^131320644 is an apocalyptic number.

131320644 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 131320644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192205440).

131320644 is an abundant number, since it is smaller than the sum of its proper divisors (253090236).

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

131320644 is a wasteful number, since it uses less digits than its factorization.

131320644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2349 (or 2347 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 131320644 is about 11459.5219795592. The cubic root of 131320644 is about 508.2893395830.

Adding to 131320644 its reverse (446023131), we get a palindrome (577343775).

The spelling of 131320644 in words is "one hundred thirty-one million, three hundred twenty thousand, six hundred forty-four".