31211161745120 has 96 divisors (see below), whose sum is σ = 84511599480000. Its totient is φ = 10670307803136.

The previous prime is 31211161745087. The next prime is 31211161745143. The reversal of 31211161745120 is 2154716111213.

It is a Harshad number since it is a multiple of its sum of digits (35).

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, 39533345 + ... + 40315104.

It is an arithmetic number, because the mean of its divisors is an integer number (880329161250).

Almost surely, 2^{31211161745120} is an apocalyptic number.

It is an amenable number.

31211161745120 is an abundant number, since it is smaller than the sum of its proper divisors (53300437734880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31211161745120 is a wasteful number, since it uses less digits than its factorization.

31211161745120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79848820 (or 79848812 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 35.

Adding to 31211161745120 its reverse (2154716111213), we get a palindrome (33365877856333).

The spelling of 31211161745120 in words is "thirty-one trillion, two hundred eleven billion, one hundred sixty-one million, seven hundred forty-five thousand, one hundred twenty".