51244399 has 2 divisors, whose sum is σ = 51244400. Its totient is φ = 51244398.

The previous prime is 51244379. The next prime is 51244447. The reversal of 51244399 is 99344215.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51244399 - 2⁹ = 51243887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51244339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25622199 + 25622200.

It is an arithmetic number, because the mean of its divisors is an integer number (25622200).

Almost surely, 2^51244399 is an apocalyptic number.

51244399 is a deficient number, since it is larger than the sum of its proper divisors (1).

51244399 is an equidigital number, since it uses as much as digits as its factorization.

51244399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 37.

The square root of 51244399 is about 7158.5193301408. The cubic root of 51244399 is about 371.4344100026.

The spelling of 51244399 in words is "fifty-one million, two hundred forty-four thousand, three hundred ninety-nine".