51187238 has 8 divisors (see below), whose sum is σ = 81297432. Its totient is φ = 24088096.

The previous prime is 51187219. The next prime is 51187247. The reversal of 51187238 is 83278115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51187198 and 51187207.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 752720 + ... + 752787.

It is an arithmetic number, because the mean of its divisors is an integer number (10162179).

Almost surely, 2^51187238 is an apocalyptic number.

51187238 is a deficient number, since it is larger than the sum of its proper divisors (30110194).

51187238 is a wasteful number, since it uses less digits than its factorization.

51187238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1505526.

The product of its digits is 13440, while the sum is 35.

The square root of 51187238 is about 7154.5257005618. The cubic root of 51187238 is about 371.2962520645.

The spelling of 51187238 in words is "fifty-one million, one hundred eighty-seven thousand, two hundred thirty-eight".