31130123213 has 48 divisors (see below), whose sum is σ = 38265477120. Its totient is φ = 25216984800.

The previous prime is 31130123161. The next prime is 31130123231. The reversal of 31130123213 is 31232103113.

It is not a de Polignac number, because 31130123213 - 2⁸ = 31130122957 is a prime.

It is a super-2 number, since 2×31130123213² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31130123293) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14607158 + ... + 14609288.

It is an arithmetic number, because the mean of its divisors is an integer number (797197440).

Almost surely, 2^31130123213 is an apocalyptic number.

It is an amenable number.

31130123213 is a deficient number, since it is larger than the sum of its proper divisors (7135353907).

31130123213 is a wasteful number, since it uses less digits than its factorization.

31130123213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2398 (or 2391 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31130123213 its reverse (31232103113), we get a palindrome (62362226326).

The spelling of 31130123213 in words is "thirty-one billion, one hundred thirty million, one hundred twenty-three thousand, two hundred thirteen".