51683993 has 2 divisors, whose sum is σ = 51683994. Its totient is φ = 51683992.

The previous prime is 51683987. The next prime is 51684043. The reversal of 51683993 is 39938615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44782864 + 6901129 = 6692^2 + 2627^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51683993 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (51653993) 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 as a sum of consecutive naturals, namely, 25841996 + 25841997.

It is an arithmetic number, because the mean of its divisors is an integer number (25841997).

Almost surely, 2^51683993 is an apocalyptic number.

It is an amenable number.

51683993 is a deficient number, since it is larger than the sum of its proper divisors (1).

51683993 is an equidigital number, since it uses as much as digits as its factorization.

51683993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 44.

The square root of 51683993 is about 7189.1580174593. The cubic root of 51683993 is about 372.4934893687.

The spelling of 51683993 in words is "fifty-one million, six hundred eighty-three thousand, nine hundred ninety-three".