51400621 has 2 divisors, whose sum is σ = 51400622. Its totient is φ = 51400620.

The previous prime is 51400579. The next prime is 51400627. The reversal of 51400621 is 12600415.

51400621 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., 33802596 + 17598025 = 5814^2 + 4195^2 .

It is a cyclic number.

It is not a de Polignac number, because 51400621 - 2¹¹ = 51398573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51400627) 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, 25700310 + 25700311.

It is an arithmetic number, because the mean of its divisors is an integer number (25700311).

Almost surely, 2^51400621 is an apocalyptic number.

It is an amenable number.

51400621 is a deficient number, since it is larger than the sum of its proper divisors (1).

51400621 is an equidigital number, since it uses as much as digits as its factorization.

51400621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 51400621 is about 7169.4226406315. The cubic root of 51400621 is about 371.8114746938.

The spelling of 51400621 in words is "fifty-one million, four hundred thousand, six hundred twenty-one".