51550215 has 8 divisors (see below), whose sum is σ = 82480368. Its totient is φ = 27493440.

The previous prime is 51550207. The next prime is 51550229. The reversal of 51550215 is 51205515.

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

It is not a de Polignac number, because 51550215 - 2³ = 51550207 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1718326 + ... + 1718355.

It is an arithmetic number, because the mean of its divisors is an integer number (10310046).

Almost surely, 2^51550215 is an apocalyptic number.

51550215 is a deficient number, since it is larger than the sum of its proper divisors (30930153).

51550215 is a wasteful number, since it uses less digits than its factorization.

51550215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3436689.

The product of its (nonzero) digits is 1250, while the sum is 24.

The square root of 51550215 is about 7179.8478396133. The cubic root of 51550215 is about 372.1718263331.

The spelling of 51550215 in words is "fifty-one million, five hundred fifty thousand, two hundred fifteen".