31517214440 has 32 divisors (see below), whose sum is σ = 74646036000. Its totient is φ = 11943365184.

The previous prime is 31517214431. The next prime is 31517214451. The reversal of 31517214440 is 4441271513.

It is a junction number, because it is equal to n+sod(n) for n = 31517214397 and 31517214406.

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 7 ways as a sum of consecutive naturals, for example, 20734250 + ... + 20735769.

It is an arithmetic number, because the mean of its divisors is an integer number (2332688625).

Almost surely, 2^31517214440 is an apocalyptic number.

It is an amenable number.

31517214440 is an abundant number, since it is smaller than the sum of its proper divisors (43128821560).

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

31517214440 is a wasteful number, since it uses less digits than its factorization.

31517214440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41470049 (or 41470045 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

Adding to 31517214440 its reverse (4441271513), we get a palindrome (35958485953).

The spelling of 31517214440 in words is "thirty-one billion, five hundred seventeen million, two hundred fourteen thousand, four hundred forty".