31729206493 has 4 divisors (see below), whose sum is σ = 31729856220. Its totient is φ = 31728556768.

The previous prime is 31729206479. The next prime is 31729206511. The reversal of 31729206493 is 39460292713.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39460292713 = 17 ⋅2321193689.

It can be written as a sum of positive squares in 2 ways, for example, as 26226830809 + 5502375684 = 161947^2 + 74178^2 .

It is a cyclic number.

It is not a de Polignac number, because 31729206493 - 2⁵ = 31729206461 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 (31729206463) 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, 245080 + ... + 351457.

It is an arithmetic number, because the mean of its divisors is an integer number (7932464055).

Almost surely, 2^31729206493 is an apocalyptic number.

It is an amenable number.

31729206493 is a deficient number, since it is larger than the sum of its proper divisors (649727).

31729206493 is an equidigital number, since it uses as much as digits as its factorization.

31729206493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649726.

The product of its (nonzero) digits is 489888, while the sum is 46.

The spelling of 31729206493 in words is "thirty-one billion, seven hundred twenty-nine million, two hundred six thousand, four hundred ninety-three".