51320999 has 2 divisors, whose sum is σ = 51321000. Its totient is φ = 51320998.

The previous prime is 51320989. The next prime is 51321037. The reversal of 51320999 is 99902315.

51320999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (51321037) can be obtained adding 51320999 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51320999 - 2⁸ = 51320743 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51320939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25660499 + 25660500.

It is an arithmetic number, because the mean of its divisors is an integer number (25660500).

Almost surely, 2^51320999 is an apocalyptic number.

51320999 is a deficient number, since it is larger than the sum of its proper divisors (1).

51320999 is an equidigital number, since it uses as much as digits as its factorization.

51320999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21870, while the sum is 38.

The square root of 51320999 is about 7163.8676006749. The cubic root of 51320999 is about 371.6193909405.

It can be divided in two parts, 513 and 20999, that added together give a palindrome (21512).

The spelling of 51320999 in words is "fifty-one million, three hundred twenty thousand, nine hundred ninety-nine".