51009799 has 2 divisors, whose sum is σ = 51009800. Its totient is φ = 51009798.

The previous prime is 51009779. The next prime is 51009817. The reversal of 51009799 is 99790015.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51009799 - 2⁷ = 51009671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51009719) 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, 25504899 + 25504900.

It is an arithmetic number, because the mean of its divisors is an integer number (25504900).

Almost surely, 2^51009799 is an apocalyptic number.

51009799 is a deficient number, since it is larger than the sum of its proper divisors (1).

51009799 is an equidigital number, since it uses as much as digits as its factorization.

51009799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25515, while the sum is 40.

The square root of 51009799 is about 7142.1144628184. The cubic root of 51009799 is about 370.8667263228.

The spelling of 51009799 in words is "fifty-one million, nine thousand, seven hundred ninety-nine".