51508823 has 2 divisors, whose sum is σ = 51508824. Its totient is φ = 51508822.

The previous prime is 51508819. The next prime is 51508871. The reversal of 51508823 is 32880515.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51508823 - 2² = 51508819 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51508823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51508123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25754411 + 25754412.

It is an arithmetic number, because the mean of its divisors is an integer number (25754412).

Almost surely, 2^51508823 is an apocalyptic number.

51508823 is a deficient number, since it is larger than the sum of its proper divisors (1).

51508823 is an equidigital number, since it uses as much as digits as its factorization.

51508823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 51508823 is about 7176.9647484156. The cubic root of 51508823 is about 372.0721884610.

The spelling of 51508823 in words is "fifty-one million, five hundred eight thousand, eight hundred twenty-three".