31981010045 has 16 divisors (see below), whose sum is σ = 42773365440. Its totient is φ = 22812459264.

The previous prime is 31981010027. The next prime is 31981010053. The reversal of 31981010045 is 54001018913.

It is a cyclic number.

It is not a de Polignac number, because 31981010045 - 2¹⁴ = 31980993661 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31981009993 and 31981010020.

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 15 ways as a sum of consecutive naturals, for example, 9899627 + ... + 9902856.

It is an arithmetic number, because the mean of its divisors is an integer number (2673335340).

Almost surely, 2^31981010045 is an apocalyptic number.

It is an amenable number.

31981010045 is a deficient number, since it is larger than the sum of its proper divisors (10792355395).

31981010045 is a wasteful number, since it uses less digits than its factorization.

31981010045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19802524.

The product of its (nonzero) digits is 4320, while the sum is 32.

Adding to 31981010045 its reverse (54001018913), we get a palindrome (85982028958).

The spelling of 31981010045 in words is "thirty-one billion, nine hundred eighty-one million, ten thousand, forty-five".