31210808605 has 4 divisors (see below), whose sum is σ = 37452970332. Its totient is φ = 24968646880.

The previous prime is 31210808581. The next prime is 31210808611. The reversal of 31210808605 is 50680801213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50680801213 = 7 ⋅7240114459.

It can be written as a sum of positive squares in 2 ways, for example, as 10200596004 + 21010212601 = 100998^2 + 144949^2 .

It is not a de Polignac number, because 31210808605 - 2²¹ = 31208711453 is a prime.

It is a super-2 number, since 2×31210808605² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 3121080856 + ... + 3121080865.

It is an arithmetic number, because the mean of its divisors is an integer number (9363242583).

Almost surely, 2^31210808605 is an apocalyptic number.

It is an amenable number.

31210808605 is a deficient number, since it is larger than the sum of its proper divisors (6242161727).

31210808605 is an equidigital number, since it uses as much as digits as its factorization.

31210808605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6242161726.

The product of its (nonzero) digits is 11520, while the sum is 34.

The spelling of 31210808605 in words is "thirty-one billion, two hundred ten million, eight hundred eight thousand, six hundred five".