51208315 has 4 divisors (see below), whose sum is σ = 61449984. Its totient is φ = 40966648.

The previous prime is 51208277. The next prime is 51208343. The reversal of 51208315 is 51380215.

It is a happy number.

51208315 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51208315 - 2²¹ = 49111163 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51208315.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5120827 + ... + 5120836.

It is an arithmetic number, because the mean of its divisors is an integer number (15362496).

Almost surely, 2^51208315 is an apocalyptic number.

51208315 is a deficient number, since it is larger than the sum of its proper divisors (10241669).

51208315 is a wasteful number, since it uses less digits than its factorization.

51208315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10241668.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 51208315 is about 7155.9985326997. The cubic root of 51208315 is about 371.3472070651.

The spelling of 51208315 in words is "fifty-one million, two hundred eight thousand, three hundred fifteen".