51649144 has 32 divisors (see below), whose sum is σ = 102960000. Its totient is φ = 24220512.

The previous prime is 51649141. The next prime is 51649159. The reversal of 51649144 is 44194615.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51649141) 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 7 ways as a sum of consecutive naturals, for example, 14007 + ... + 17305.

It is an arithmetic number, because the mean of its divisors is an integer number (3217500).

Almost surely, 2^51649144 is an apocalyptic number.

It is an amenable number.

51649144 is a deficient number, since it is larger than the sum of its proper divisors (51310856).

51649144 is a wasteful number, since it uses less digits than its factorization.

51649144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3427 (or 3423 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 51649144 is about 7186.7338896052. The cubic root of 51649144 is about 372.4097500681.

The spelling of 51649144 in words is "fifty-one million, six hundred forty-nine thousand, one hundred forty-four".