51404621 has 2 divisors, whose sum is σ = 51404622. Its totient is φ = 51404620.

The previous prime is 51404597. The next prime is 51404623. The reversal of 51404621 is 12640415.

51404621 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., 36735721 + 14668900 = 6061^2 + 3830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51404621 is a prime.

Together with 51404623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51404623) 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, 25702310 + 25702311.

It is an arithmetic number, because the mean of its divisors is an integer number (25702311).

Almost surely, 2^51404621 is an apocalyptic number.

It is an amenable number.

51404621 is a deficient number, since it is larger than the sum of its proper divisors (1).

51404621 is an equidigital number, since it uses as much as digits as its factorization.

51404621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 51404621 is about 7169.7015976957. The cubic root of 51404621 is about 371.8211192421.

It can be divided in two parts, 51404 and 621, that added together give a palindrome (52025).

The spelling of 51404621 in words is "fifty-one million, four hundred four thousand, six hundred twenty-one".