31123012312 has 64 divisors (see below), whose sum is σ = 68315385600. Its totient is φ = 13014449280.

The previous prime is 31123012267. The next prime is 31123012313. The reversal of 31123012312 is 21321032113.

It is a self number, because there is not a number n which added to its sum of digits gives 31123012312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123012313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2452239 + ... + 2464897.

It is an arithmetic number, because the mean of its divisors is an integer number (1067427900).

Almost surely, 2^31123012312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31123012312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34157692800).

31123012312 is an abundant number, since it is smaller than the sum of its proper divisors (37192373288).

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

31123012312 is a wasteful number, since it uses less digits than its factorization.

31123012312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13736 (or 13732 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31123012312 its reverse (21321032113), we get a palindrome (52444044425).

The spelling of 31123012312 in words is "thirty-one billion, one hundred twenty-three million, twelve thousand, three hundred twelve".