51644899 has 2 divisors, whose sum is σ = 51644900. Its totient is φ = 51644898.

The previous prime is 51644897. The next prime is 51644909. The reversal of 51644899 is 99844615.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51644899 - 2¹ = 51644897 is a prime.

Together with 51644897, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51644891) 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, 25822449 + 25822450.

It is an arithmetic number, because the mean of its divisors is an integer number (25822450).

Almost surely, 2^51644899 is an apocalyptic number.

51644899 is a deficient number, since it is larger than the sum of its proper divisors (1).

51644899 is an equidigital number, since it uses as much as digits as its factorization.

51644899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 46.

The square root of 51644899 is about 7186.4385477092. The cubic root of 51644899 is about 372.3995471064.

The spelling of 51644899 in words is "fifty-one million, six hundred forty-four thousand, eight hundred ninety-nine".