31371123685 has 24 divisors (see below), whose sum is σ = 41788543608. Its totient is φ = 22589424000.

The previous prime is 31371123583. The next prime is 31371123697. The reversal of 31371123685 is 58632117313.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1871687169 + 29499436516 = 43263^2 + 171754^2 .

It is not a de Polignac number, because 31371123685 - 2¹¹ = 31371121637 is a prime.

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 (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 195594 + ... + 317803.

It is an arithmetic number, because the mean of its divisors is an integer number (1741189317).

Almost surely, 2^31371123685 is an apocalyptic number.

It is an amenable number.

31371123685 is a deficient number, since it is larger than the sum of its proper divisors (10417419923).

31371123685 is a wasteful number, since it uses less digits than its factorization.

31371123685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513525 (or 513514 counting only the distinct ones).

The product of its digits is 90720, while the sum is 40.

The spelling of 31371123685 in words is "thirty-one billion, three hundred seventy-one million, one hundred twenty-three thousand, six hundred eighty-five".