51621133 has 2 divisors, whose sum is σ = 51621134. Its totient is φ = 51621132.

The previous prime is 51621127. The next prime is 51621137. The reversal of 51621133 is 33112615.

It is a happy number.

51621133 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43797924 + 7823209 = 6618^2 + 2797^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51621133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51621137) 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, 25810566 + 25810567.

It is an arithmetic number, because the mean of its divisors is an integer number (25810567).

Almost surely, 2^51621133 is an apocalyptic number.

It is an amenable number.

51621133 is a deficient number, since it is larger than the sum of its proper divisors (1).

51621133 is an equidigital number, since it uses as much as digits as its factorization.

51621133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 22.

The square root of 51621133 is about 7184.7848262839. The cubic root of 51621133 is about 372.3424146128.

Adding to 51621133 its reverse (33112615), we get a palindrome (84733748).

The spelling of 51621133 in words is "fifty-one million, six hundred twenty-one thousand, one hundred thirty-three".