31123230320 has 160 divisors (see below), whose sum is σ = 89149377408. Its totient is φ = 9840144384.

The previous prime is 31123230317. The next prime is 31123230323. The reversal of 31123230320 is 2303232113.

It is an interprime number because it is at equal distance from previous prime (31123230317) and next prime (31123230323).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31123230292 and 31123230301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123230323) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11624822 + ... + 11627498.

Almost surely, 2^31123230320 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 31123230320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44574688704).

31123230320 is an abundant number, since it is smaller than the sum of its proper divisors (58026147088).

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

31123230320 is a wasteful number, since it uses less digits than its factorization.

31123230320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4307 (or 4301 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 31123230320 its reverse (2303232113), we get a palindrome (33426462433).

The spelling of 31123230320 in words is "thirty-one billion, one hundred twenty-three million, two hundred thirty thousand, three hundred twenty".