1531331139 has 24 divisors (see below), whose sum is σ = 2230565040. Its totient is φ = 933983232.

The previous prime is 1531331119. The next prime is 1531331141. The reversal of 1531331139 is 9311331351.

It is not a de Polignac number, because 1531331139 - 2⁵ = 1531331107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1531331119) 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 23 ways as a sum of consecutive naturals, for example, 43927 + ... + 70655.

It is an arithmetic number, because the mean of its divisors is an integer number (92940210).

Almost surely, 2^1531331139 is an apocalyptic number.

1531331139 is a deficient number, since it is larger than the sum of its proper divisors (699233901).

1531331139 is a wasteful number, since it uses less digits than its factorization.

1531331139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26871 (or 26858 counting only the distinct ones).

The product of its digits is 3645, while the sum is 30.

The square root of 1531331139 is about 39132.2263486247. The cubic root of 1531331139 is about 1152.6294310872.

The spelling of 1531331139 in words is "one billion, five hundred thirty-one million, three hundred thirty-one thousand, one hundred thirty-nine".