31481444 has 6 divisors (see below), whose sum is σ = 55092534. Its totient is φ = 15740720.

The previous prime is 31481431. The next prime is 31481449. The reversal of 31481444 is 44418413.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18593344 + 12888100 = 4312^2 + 3590^2 .

It is not an unprimeable number, because it can be changed into a prime (31481449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3935177 + ... + 3935184.

It is an arithmetic number, because the mean of its divisors is an integer number (9182089).

Almost surely, 2^31481444 is an apocalyptic number.

It is an amenable number.

31481444 is a deficient number, since it is larger than the sum of its proper divisors (23611090).

31481444 is a wasteful number, since it uses less digits than its factorization.

31481444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7870365 (or 7870363 counting only the distinct ones).

The product of its digits is 6144, while the sum is 29.

The square root of 31481444 is about 5610.8327367691. The cubic root of 31481444 is about 315.7559537501.

Adding to 31481444 its reverse (44418413), we get a palindrome (75899857).

The spelling of 31481444 in words is "thirty-one million, four hundred eighty-one thousand, four hundred forty-four".