31231130000 has 150 divisors (see below), whose sum is σ = 87960160926. Its totient is φ = 10707648000.

The previous prime is 31231129987. The next prime is 31231130003. The reversal of 31231130000 is 3113213.

It can be written as a sum of positive squares in 5 ways, for example, as 23638447504 + 7592682496 = 153748^2 + 87136^2 .

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (31231130003) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 458132 + ... + 521868.

Almost surely, 2^31231130000 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 31231130000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43980080463).

31231130000 is an abundant number, since it is smaller than the sum of its proper divisors (56729030926).

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

31231130000 is an equidigital number, since it uses as much as digits as its factorization.

31231130000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63779 (or 63751 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 14.

Adding to 31231130000 its reverse (3113213), we get a palindrome (31234243213).

The spelling of 31231130000 in words is "thirty-one billion, two hundred thirty-one million, one hundred thirty thousand".