31123230330 has 64 divisors (see below), whose sum is σ = 76375042560. Its totient is φ = 8113357824.

The previous prime is 31123230323. The next prime is 31123230337. The reversal of 31123230330 is 3303232113.

It is an interprime number because it is at equal distance from previous prime (31123230323) and next prime (31123230337).

It is a junction number, because it is equal to n+sod(n) for n = 31123230297 and 31123230306.

It is not an unprimeable number, because it can be changed into a prime (31123230337) 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, 1223986 + ... + 1249154.

It is an arithmetic number, because the mean of its divisors is an integer number (1193360040).

Almost surely, 2^31123230330 is an apocalyptic number.

31123230330 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31123230330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38187521280).

31123230330 is an abundant number, since it is smaller than the sum of its proper divisors (45251812230).

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

31123230330 is a wasteful number, since it uses less digits than its factorization.

31123230330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26103.

The product of its (nonzero) digits is 972, while the sum is 21.

Adding to 31123230330 its reverse (3303232113), we get a palindrome (34426462443).

The spelling of 31123230330 in words is "thirty-one billion, one hundred twenty-three million, two hundred thirty thousand, three hundred thirty".