51645263 has 2 divisors, whose sum is σ = 51645264. Its totient is φ = 51645262.

The previous prime is 51645247. The next prime is 51645299. The reversal of 51645263 is 36254615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51645263 - 2⁴ = 51645247 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51645203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25822631 + 25822632.

It is an arithmetic number, because the mean of its divisors is an integer number (25822632).

Almost surely, 2^51645263 is an apocalyptic number.

51645263 is a deficient number, since it is larger than the sum of its proper divisors (1).

51645263 is an equidigital number, since it uses as much as digits as its factorization.

51645263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 32.

The square root of 51645263 is about 7186.4638731437. The cubic root of 51645263 is about 372.4004220113.

Adding to 51645263 its reverse (36254615), we get a palindrome (87899878).

The spelling of 51645263 in words is "fifty-one million, six hundred forty-five thousand, two hundred sixty-three".