31481608 has 16 divisors (see below), whose sum is σ = 59251500. Its totient is φ = 15681216.

The previous prime is 31481591. The next prime is 31481609. The reversal of 31481608 is 80618413.

It can be written as a sum of positive squares in 2 ways, for example, as 25826724 + 5654884 = 5082^2 + 2378^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31481608.

It is not an unprimeable number, because it can be changed into a prime (31481609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5163 + ... + 9466.

Almost surely, 2^31481608 is an apocalyptic number.

It is an amenable number.

31481608 is a deficient number, since it is larger than the sum of its proper divisors (27769892).

31481608 is a wasteful number, since it uses less digits than its factorization.

31481608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14904 (or 14900 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 31481608 is about 5610.8473513365. The cubic root of 31481608 is about 315.7565020507.

The spelling of 31481608 in words is "thirty-one million, four hundred eighty-one thousand, six hundred eight".