51709993 has 2 divisors, whose sum is σ = 51709994. Its totient is φ = 51709992.

The previous prime is 51709967. The next prime is 51710027. The reversal of 51709993 is 39990715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51451929 + 258064 = 7173^2 + 508^2 .

It is a cyclic number.

It is not a de Polignac number, because 51709993 - 2⁵ = 51709961 is a prime.

It is not a weakly prime, because it can be changed into another prime (51709943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25854996 + 25854997.

It is an arithmetic number, because the mean of its divisors is an integer number (25854997).

Almost surely, 2^51709993 is an apocalyptic number.

It is an amenable number.

51709993 is a deficient number, since it is larger than the sum of its proper divisors (1).

51709993 is an equidigital number, since it uses as much as digits as its factorization.

51709993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76545, while the sum is 43.

The square root of 51709993 is about 7190.9660686169. The cubic root of 51709993 is about 372.5559407300. Note that the first 3 decimals are identical.

The spelling of 51709993 in words is "fifty-one million, seven hundred nine thousand, nine hundred ninety-three".