51659993 has 16 divisors (see below), whose sum is σ = 67799040. Its totient is φ = 38134800.

The previous prime is 51659989. The next prime is 51660017. The reversal of 51659993 is 39995615.

It is not a de Polignac number, because 51659993 - 2² = 51659989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51659903) 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 15 ways as a sum of consecutive naturals, for example, 16193 + ... + 19118.

It is an arithmetic number, because the mean of its divisors is an integer number (4237440).

Almost surely, 2^51659993 is an apocalyptic number.

It is an amenable number.

51659993 is a deficient number, since it is larger than the sum of its proper divisors (16139047).

51659993 is a wasteful number, since it uses less digits than its factorization.

51659993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35348.

The product of its digits is 328050, while the sum is 47.

The square root of 51659993 is about 7187.4886434693. The cubic root of 51659993 is about 372.4358233658.

The spelling of 51659993 in words is "fifty-one million, six hundred fifty-nine thousand, nine hundred ninety-three".