31105144 has 48 divisors (see below), whose sum is σ = 68266800. Its totient is φ = 13014144.

The previous prime is 31105141. The next prime is 31105157. The reversal of 31105144 is 44150113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31105141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 349452 + ... + 349540.

It is an arithmetic number, because the mean of its divisors is an integer number (1422225).

Almost surely, 2^31105144 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 31105144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34133400).

31105144 is an abundant number, since it is smaller than the sum of its proper divisors (37161656).

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

31105144 is an equidigital number, since it uses as much as digits as its factorization.

31105144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 31105144 is about 5577.1985799324. The cubic root of 31105144 is about 314.4928228753.

Adding to 31105144 its reverse (44150113), we get a palindrome (75255257).

The spelling of 31105144 in words is "thirty-one million, one hundred five thousand, one hundred forty-four".