31000130440 has 16 divisors (see below), whose sum is σ = 69750293580. Its totient is φ = 12400052160.

The previous prime is 31000130429. The next prime is 31000130461. The reversal of 31000130440 is 4403100013.

It can be written as a sum of positive squares in 2 ways, for example, as 30004475524 + 995654916 = 173218^2 + 31554^2 .

It is a super-2 number, since 2×31000130440² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387501591 + ... + 387501670.

Almost surely, 2^31000130440 is an apocalyptic number.

It is an amenable number.

31000130440 is an abundant number, since it is smaller than the sum of its proper divisors (38750163140).

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

31000130440 is a wasteful number, since it uses less digits than its factorization.

31000130440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775003272 (or 775003268 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 31000130440 its reverse (4403100013), we get a palindrome (35403230453).

The spelling of 31000130440 in words is "thirty-one billion, one hundred thirty thousand, four hundred forty".