51363687 has 4 divisors (see below), whose sum is σ = 68484920. Its totient is φ = 34242456.

The previous prime is 51363677. The next prime is 51363721. The reversal of 51363687 is 78636315.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51363687 - 2¹⁵ = 51330919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51363617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8560612 + ... + 8560617.

It is an arithmetic number, because the mean of its divisors is an integer number (17121230).

Almost surely, 2^51363687 is an apocalyptic number.

51363687 is a deficient number, since it is larger than the sum of its proper divisors (17121233).

51363687 is a wasteful number, since it uses less digits than its factorization.

51363687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17121232.

The product of its digits is 90720, while the sum is 39.

The square root of 51363687 is about 7166.8463775918. The cubic root of 51363687 is about 371.7223981079.

The spelling of 51363687 in words is "fifty-one million, three hundred sixty-three thousand, six hundred eighty-seven".