51320215 has 8 divisors (see below), whose sum is σ = 62594208. Its totient is φ = 40382880.

The previous prime is 51320207. The next prime is 51320237. The reversal of 51320215 is 51202315.

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

It is not a de Polignac number, because 51320215 - 2³ = 51320207 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51320192 and 51320201.

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, 83827 + ... + 84436.

It is an arithmetic number, because the mean of its divisors is an integer number (7824276).

Almost surely, 2^51320215 is an apocalyptic number.

51320215 is a deficient number, since it is larger than the sum of its proper divisors (11273993).

51320215 is a wasteful number, since it uses less digits than its factorization.

51320215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168329.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 51320215 is about 7163.8128814201. The cubic root of 51320215 is about 371.6174985957.

The spelling of 51320215 in words is "fifty-one million, three hundred twenty thousand, two hundred fifteen".