31604621604605 has 12 divisors (see below), whose sum is σ = 44117471791260. Its totient is φ = 21671740528704.

The previous prime is 31604621604559. The next prime is 31604621604629. The reversal of 31604621604605 is 50640612640613.

It can be written as a sum of positive squares in 2 ways, for example, as 10575848714809 + 21028772889796 = 3252053^2 + 4585714^2 .

It is not a de Polignac number, because 31604621604605 - 2¹⁸ = 31604621342461 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64499227520 + ... + 64499228009.

It is an arithmetic number, because the mean of its divisors is an integer number (3676455982605).

Almost surely, 2^{31604621604605} is an apocalyptic number.

31604621604605 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31604621604605 is a deficient number, since it is larger than the sum of its proper divisors (12512850186655).

31604621604605 is a wasteful number, since it uses less digits than its factorization.

31604621604605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128998455548 (or 128998455541 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 31604621604605 in words is "thirty-one trillion, six hundred four billion, six hundred twenty-one million, six hundred four thousand, six hundred five".