31493866519 has 4 divisors (see below), whose sum is σ = 31529534296. Its totient is φ = 31458198744.

The previous prime is 31493866501. The next prime is 31493866531. The reversal of 31493866519 is 91566839413.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31493866519 is a prime.

It is a super-2 number, since 2×31493866519² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31493866519.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31493866319) by changing a digit.

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, 17832564 + ... + 17834329.

It is an arithmetic number, because the mean of its divisors is an integer number (7882383574).

Almost surely, 2^31493866519 is an apocalyptic number.

31493866519 is a deficient number, since it is larger than the sum of its proper divisors (35667777).

31493866519 is an equidigital number, since it uses as much as digits as its factorization.

31493866519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35667776.

The product of its digits is 4199040, while the sum is 55.

The spelling of 31493866519 in words is "thirty-one billion, four hundred ninety-three million, eight hundred sixty-six thousand, five hundred nineteen".