131866644 has 108 divisors (see below), whose sum is σ = 387866304. Its totient is φ = 34751808.

The previous prime is 131866627. The next prime is 131866649. The reversal of 131866644 is 446668131.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131866649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 98709 + ... + 100035.

Almost surely, 2^131866644 is an apocalyptic number.

131866644 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 131866644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193933152).

131866644 is an abundant number, since it is smaller than the sum of its proper divisors (255999660).

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

131866644 is a wasteful number, since it uses less digits than its factorization.

131866644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1374 (or 1352 counting only the distinct ones).

The product of its digits is 82944, while the sum is 39.

The square root of 131866644 is about 11483.3202515649. The cubic root of 131866644 is about 508.9928142436.

The spelling of 131866644 in words is "one hundred thirty-one million, eight hundred sixty-six thousand, six hundred forty-four".