51388287 has 16 divisors (see below), whose sum is σ = 69463680. Its totient is φ = 33789600.

The previous prime is 51388283. The next prime is 51388303. The reversal of 51388287 is 78288315.

It is a happy number.

It is not a de Polignac number, because 51388287 - 2² = 51388283 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51388283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89712 + ... + 90282.

It is an arithmetic number, because the mean of its divisors is an integer number (4341480).

Almost surely, 2^51388287 is an apocalyptic number.

51388287 is a deficient number, since it is larger than the sum of its proper divisors (18075393).

51388287 is a wasteful number, since it uses less digits than its factorization.

51388287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934.

The product of its digits is 107520, while the sum is 42.

The square root of 51388287 is about 7168.5624081820. The cubic root of 51388287 is about 371.7817325785.

The spelling of 51388287 in words is "fifty-one million, three hundred eighty-eight thousand, two hundred eighty-seven".