131631840 has 72 divisors (see below), whose sum is σ = 449198568. Its totient is φ = 35101440.

The previous prime is 131631823. The next prime is 131631847. The reversal of 131631840 is 48136131.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131631847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44266 + ... + 47145.

It is an arithmetic number, because the mean of its divisors is an integer number (6238869).

Almost surely, 2^131631840 is an apocalyptic number.

131631840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131631840 is an abundant number, since it is smaller than the sum of its proper divisors (317566728).

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

131631840 is a wasteful number, since it uses less digits than its factorization.

131631840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91432 (or 91421 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 131631840 is about 11473.0919982366. The cubic root of 131631840 is about 508.6905276523.

Adding to 131631840 its reverse (48136131), we get a palindrome (179767971).

The spelling of 131631840 in words is "one hundred thirty-one million, six hundred thirty-one thousand, eight hundred forty".