31109290240 has 144 divisors (see below), whose sum is σ = 85395703680. Its totient is φ = 10636738560.

The previous prime is 31109290213. The next prime is 31109290291. The reversal of 31109290240 is 4209290113.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3391260 + ... + 3400420.

It is an arithmetic number, because the mean of its divisors is an integer number (593025720).

Almost surely, 2^31109290240 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 31109290240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42697851840).

31109290240 is an abundant number, since it is smaller than the sum of its proper divisors (54286413440).

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

31109290240 is an equidigital number, since it uses as much as digits as its factorization.

31109290240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9568 (or 9554 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The spelling of 31109290240 in words is "thirty-one billion, one hundred nine million, two hundred ninety thousand, two hundred forty".