31020323130 has 96 divisors (see below), whose sum is σ = 85689820944. Its totient is φ = 7758809088.

The previous prime is 31020323069. The next prime is 31020323141. The reversal of 31020323130 is 3132302013.

31020323130 is a `hidden beast` number, since 310 + 2 + 0 + 323 + 1 + 30 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 29593976841 + 1426346289 = 172029^2 + 37767^2 .

It is a super-2 number, since 2×31020323130² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 413692 + ... + 482888.

Almost surely, 2^31020323130 is an apocalyptic number.

31020323130 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 31020323130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42844910472).

31020323130 is an abundant number, since it is smaller than the sum of its proper divisors (54669497814).

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

31020323130 is a wasteful number, since it uses less digits than its factorization.

31020323130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69520 (or 69517 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 31020323130 its reverse (3132302013), we get a palindrome (34152625143).

It can be divided in two parts, 310203 and 23130, that added together give a palindrome (333333).

The spelling of 31020323130 in words is "thirty-one billion, twenty million, three hundred twenty-three thousand, one hundred thirty".