31517214439 has 4 divisors (see below), whose sum is σ = 31518613224. Its totient is φ = 31515815656.

The previous prime is 31517214431. The next prime is 31517214451. The reversal of 31517214439 is 93441271513.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31517214439 - 2³ = 31517214431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31517214431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 665032 + ... + 710845.

It is an arithmetic number, because the mean of its divisors is an integer number (7879653306).

Almost surely, 2^31517214439 is an apocalyptic number.

31517214439 is a deficient number, since it is larger than the sum of its proper divisors (1398785).

31517214439 is a wasteful number, since it uses less digits than its factorization.

31517214439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398784.

The product of its digits is 90720, while the sum is 40.

The spelling of 31517214439 in words is "thirty-one billion, five hundred seventeen million, two hundred fourteen thousand, four hundred thirty-nine".