31123303104 has 112 divisors (see below), whose sum is σ = 83807612928. Its totient is φ = 10191295488.

The previous prime is 31123303103. The next prime is 31123303109. The reversal of 31123303104 is 40130332113.

It is a super-2 number, since 2×31123303104² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31123303103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4923754 + ... + 4930070.

Almost surely, 2^31123303104 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 31123303104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41903806464).

31123303104 is an abundant number, since it is smaller than the sum of its proper divisors (52684309824).

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

31123303104 is a wasteful number, since it uses less digits than its factorization.

31123303104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6782 (or 6772 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31123303104 its reverse (40130332113), we get a palindrome (71253635217).

The spelling of 31123303104 in words is "thirty-one billion, one hundred twenty-three million, three hundred three thousand, one hundred four".