51388263 has 40 divisors (see below), whose sum is σ = 82642032. Its totient is φ = 31705344.

The previous prime is 51388247. The next prime is 51388273. The reversal of 51388263 is 36288315.

51388263 is a `hidden beast` number, since 513 + 8 + 82 + 63 = 666.

51388263 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51388263 - 2⁴ = 51388247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51388223) 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 in 39 ways as a sum of consecutive naturals, for example, 91981 + ... + 92537.

Almost surely, 2^51388263 is an apocalyptic number.

51388263 is a deficient number, since it is larger than the sum of its proper divisors (31253769).

51388263 is a wasteful number, since it uses less digits than its factorization.

51388263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653 (or 644 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 51388263 is about 7168.5607342060. The cubic root of 51388263 is about 371.7816747004.

The spelling of 51388263 in words is "fifty-one million, three hundred eighty-eight thousand, two hundred sixty-three".