31123023213 has 8 divisors (see below), whose sum is σ = 42928308000. Its totient is φ = 20033210288.

The previous prime is 31123023203. The next prime is 31123023247. The reversal of 31123023213 is 31232032113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31123023213 - 2²⁴ = 31106245997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31123023213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123023203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178867863 + ... + 178868036.

It is an arithmetic number, because the mean of its divisors is an integer number (5366038500).

Almost surely, 2^31123023213 is an apocalyptic number.

It is an amenable number.

31123023213 is a deficient number, since it is larger than the sum of its proper divisors (11805284787).

31123023213 is a wasteful number, since it uses less digits than its factorization.

31123023213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357735931.

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

Adding to 31123023213 its reverse (31232032113), we get a palindrome (62355055326).

The spelling of 31123023213 in words is "thirty-one billion, one hundred twenty-three million, twenty-three thousand, two hundred thirteen".