31245144 has 72 divisors (see below), whose sum is σ = 91426860. Its totient is φ = 8872416.

The previous prime is 31245121. The next prime is 31245163. The reversal of 31245144 is 44154213.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

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 17 ways as a sum of consecutive naturals, for example, 191607 + ... + 191769.

Almost surely, 2^31245144 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 31245144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45713430).

31245144 is an abundant number, since it is smaller than the sum of its proper divisors (60181716).

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

31245144 is a wasteful number, since it uses less digits than its factorization.

31245144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349 (or 175 counting only the distinct ones).

The product of its digits is 1920, while the sum is 24.

The square root of 31245144 is about 5589.7355930312. The cubic root of 31245144 is about 314.9639464909.

Multiplying 31245144 by its sum of digits (24), we get a square (749883456 = 27384²).

31245144 divided by its sum of digits (24) gives a square (1301881 = 1141²).

Adding to 31245144 its reverse (44154213), we get a palindrome (75399357).

The spelling of 31245144 in words is "thirty-one million, two hundred forty-five thousand, one hundred forty-four".