51248215 has 4 divisors (see below), whose sum is σ = 61497864. Its totient is φ = 40998568.

The previous prime is 51248213. The next prime is 51248231. The reversal of 51248215 is 51284215.

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

It is a cyclic number.

It is not a de Polignac number, because 51248215 - 2¹ = 51248213 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 (51248213) 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, 5124817 + ... + 5124826.

It is an arithmetic number, because the mean of its divisors is an integer number (15374466).

Almost surely, 2^51248215 is an apocalyptic number.

51248215 is a deficient number, since it is larger than the sum of its proper divisors (10249649).

51248215 is a wasteful number, since it uses less digits than its factorization.

51248215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10249648.

The product of its digits is 3200, while the sum is 28.

The square root of 51248215 is about 7158.7858607448. The cubic root of 51248215 is about 371.4436296023.

The spelling of 51248215 in words is "fifty-one million, two hundred forty-eight thousand, two hundred fifteen".