51438133 has 2 divisors, whose sum is σ = 51438134. Its totient is φ = 51438132.

The previous prime is 51438131. The next prime is 51438137. The reversal of 51438133 is 33183415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48692484 + 2745649 = 6978^2 + 1657^2 .

It is a cyclic number.

It is not a de Polignac number, because 51438133 - 2¹ = 51438131 is a prime.

Together with 51438131, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51438131) 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, 25719066 + 25719067.

It is an arithmetic number, because the mean of its divisors is an integer number (25719067).

Almost surely, 2^51438133 is an apocalyptic number.

It is an amenable number.

51438133 is a deficient number, since it is larger than the sum of its proper divisors (1).

51438133 is an equidigital number, since it uses as much as digits as its factorization.

51438133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 28.

The square root of 51438133 is about 7172.0382737406. The cubic root of 51438133 is about 371.9019016200.

The spelling of 51438133 in words is "fifty-one million, four hundred thirty-eight thousand, one hundred thirty-three".