51289879 has 2 divisors, whose sum is σ = 51289880. Its totient is φ = 51289878.

The previous prime is 51289871. The next prime is 51289891. The reversal of 51289879 is 97898215.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51289879 - 2³ = 51289871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51289871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25644939 + 25644940.

It is an arithmetic number, because the mean of its divisors is an integer number (25644940).

Almost surely, 2^51289879 is an apocalyptic number.

51289879 is a deficient number, since it is larger than the sum of its proper divisors (1).

51289879 is an equidigital number, since it uses as much as digits as its factorization.

51289879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 49.

The square root of 51289879 is about 7161.6952602020. The cubic root of 51289879 is about 371.5442616302.

The spelling of 51289879 in words is "fifty-one million, two hundred eighty-nine thousand, eight hundred seventy-nine".