131281984 has 14 divisors (see below), whose sum is σ = 260512814. Its totient is φ = 65640960.

The previous prime is 131281961. The next prime is 131281991. The reversal of 131281984 is 489182131.

It can be written as a sum of positive squares in only one way, i.e., 128323584 + 2958400 = 11328^2 + 1720^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1025577 + ... + 1025704.

Almost surely, 2^131281984 is an apocalyptic number.

It is an amenable number.

131281984 is a deficient number, since it is larger than the sum of its proper divisors (129230830).

131281984 is an equidigital number, since it uses as much as digits as its factorization.

131281984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2051293 (or 2051283 counting only the distinct ones).

The product of its digits is 13824, while the sum is 37.

The square root of 131281984 is about 11457.8350485596. The cubic root of 131281984 is about 508.2394555894.

The spelling of 131281984 in words is "one hundred thirty-one million, two hundred eighty-one thousand, nine hundred eighty-four".