31481649 has 16 divisors (see below), whose sum is σ = 47011840. Its totient is φ = 20820240.

The previous prime is 31481623. The next prime is 31481677. The reversal of 31481649 is 94618413.

31481649 is a `hidden beast` number, since 3 + 1 + 4 + 8 + 1 + 649 = 666.

It is not a de Polignac number, because 31481649 - 2⁷ = 31481521 is a prime.

It is a Duffinian number.

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 (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1162 + ... + 8019.

It is an arithmetic number, because the mean of its divisors is an integer number (2938240).

Almost surely, 2^31481649 is an apocalyptic number.

It is an amenable number.

31481649 is a deficient number, since it is larger than the sum of its proper divisors (15530191).

31481649 is a wasteful number, since it uses less digits than its factorization.

31481649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9317 (or 9311 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 31481649 is about 5610.8510049724. The cubic root of 31481649 is about 315.7566391256.

The spelling of 31481649 in words is "thirty-one million, four hundred eighty-one thousand, six hundred forty-nine".