31689420329 has 4 divisors (see below), whose sum is σ = 36216480384. Its totient is φ = 27162360276.

The previous prime is 31689420307. The next prime is 31689420353. The reversal of 31689420329 is 92302498613.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31689420329 - 2²⁴ = 31672643113 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31689450329) 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, 2263530017 + ... + 2263530030.

It is an arithmetic number, because the mean of its divisors is an integer number (9054120096).

Almost surely, 2^31689420329 is an apocalyptic number.

It is an amenable number.

31689420329 is a deficient number, since it is larger than the sum of its proper divisors (4527060055).

31689420329 is an equidigital number, since it uses as much as digits as its factorization.

31689420329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4527060054.

The product of its (nonzero) digits is 559872, while the sum is 47.

The spelling of 31689420329 in words is "thirty-one billion, six hundred eighty-nine million, four hundred twenty thousand, three hundred twenty-nine".