31130000420 has 12 divisors (see below), whose sum is σ = 65373000924. Its totient is φ = 12452000160.

The previous prime is 31130000411. The next prime is 31130000533. The reversal of 31130000420 is 2400003113.

It can be written as a sum of positive squares in 2 ways, for example, as 13910787136 + 17219213284 = 117944^2 + 131222^2 .

It is a super-2 number, since 2×31130000420² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31130000395 and 31130000404.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 778249991 + ... + 778250030.

It is an arithmetic number, because the mean of its divisors is an integer number (5447750077).

Almost surely, 2^31130000420 is an apocalyptic number.

It is an amenable number.

31130000420 is an abundant number, since it is smaller than the sum of its proper divisors (34243000504).

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

31130000420 is a wasteful number, since it uses less digits than its factorization.

31130000420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1556500030 (or 1556500028 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 31130000420 its reverse (2400003113), we get a palindrome (33530003533).

The spelling of 31130000420 in words is "thirty-one billion, one hundred thirty million, four hundred twenty", and thus it is an aban number.