51630641 has 2 divisors, whose sum is σ = 51630642. Its totient is φ = 51630640.

The previous prime is 51630613. The next prime is 51630647. The reversal of 51630641 is 14603615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28398241 + 23232400 = 5329^2 + 4820^2 .

It is a cyclic number.

It is not a de Polignac number, because 51630641 - 2¹⁸ = 51368497 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51630641.

It is not a weakly prime, because it can be changed into another prime (51630647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25815320 + 25815321.

It is an arithmetic number, because the mean of its divisors is an integer number (25815321).

Almost surely, 2^51630641 is an apocalyptic number.

It is an amenable number.

51630641 is a deficient number, since it is larger than the sum of its proper divisors (1).

51630641 is an equidigital number, since it uses as much as digits as its factorization.

51630641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 51630641 is about 7185.4464718624. The cubic root of 51630641 is about 372.3652735606.

The spelling of 51630641 in words is "fifty-one million, six hundred thirty thousand, six hundred forty-one".