31513144523016 has 128 divisors (see below), whose sum is σ = 88541372989440. Its totient is φ = 9273780384000.

The previous prime is 31513144522949. The next prime is 31513144523033. The reversal of 31513144523016 is 61032544131513.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68308081 + ... + 68767871.

It is an arithmetic number, because the mean of its divisors is an integer number (691729476480).

Almost surely, 2^{31513144523016} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31513144523016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44270686494720).

31513144523016 is an abundant number, since it is smaller than the sum of its proper divisors (57028228466424).

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

31513144523016 is a wasteful number, since it uses less digits than its factorization.

31513144523016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469387 (or 469383 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

Adding to 31513144523016 its reverse (61032544131513), we get a palindrome (92545688654529).

The spelling of 31513144523016 in words is "thirty-one trillion, five hundred thirteen billion, one hundred forty-four million, five hundred twenty-three thousand, sixteen".