31011133312 has 64 divisors (see below), whose sum is σ = 65428675200. Its totient is φ = 14609954304.

The previous prime is 31011133301. The next prime is 31011133313. The reversal of 31011133312 is 21333111013.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 31011133312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31011133313) 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, 118639 + ... + 275857.

It is an arithmetic number, because the mean of its divisors is an integer number (1022323050).

Almost surely, 2^31011133312 is an apocalyptic number.

31011133312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31011133312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32714337600).

31011133312 is an abundant number, since it is smaller than the sum of its proper divisors (34417541888).

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

31011133312 is a wasteful number, since it uses less digits than its factorization.

31011133312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157323 (or 157311 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 31011133312 its reverse (21333111013), we get a palindrome (52344244325).

The spelling of 31011133312 in words is "thirty-one billion, eleven million, one hundred thirty-three thousand, three hundred twelve".