131281608 has 128 divisors (see below), whose sum is σ = 362880000. Its totient is φ = 39443712.

The previous prime is 131281607. The next prime is 131281613. The reversal of 131281608 is 806182131.

It is not an unprimeable number, because it can be changed into a prime (131281603) 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, 944403 + ... + 944541.

It is an arithmetic number, because the mean of its divisors is an integer number (2835000).

Almost surely, 2^131281608 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 131281608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181440000).

131281608 is an abundant number, since it is smaller than the sum of its proper divisors (231598392).

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

131281608 is a wasteful number, since it uses less digits than its factorization.

131281608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 255 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 131281608 is about 11457.8186405616. The cubic root of 131281608 is about 508.2389703788.

The spelling of 131281608 in words is "one hundred thirty-one million, two hundred eighty-one thousand, six hundred eight".