51919247 has 4 divisors (see below), whose sum is σ = 52650576. Its totient is φ = 51187920.

The previous prime is 51919237. The next prime is 51919253. The reversal of 51919247 is 74291915.

51919247 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 51919247 - 2⁶ = 51919183 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 51919247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51919237) by changing a digit.

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, 365558 + ... + 365699.

It is an arithmetic number, because the mean of its divisors is an integer number (13162644).

Almost surely, 2^51919247 is an apocalyptic number.

51919247 is a deficient number, since it is larger than the sum of its proper divisors (731329).

51919247 is an equidigital number, since it uses as much as digits as its factorization.

51919247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731328.

The product of its digits is 22680, while the sum is 38.

The square root of 51919247 is about 7205.5011623065. The cubic root of 51919247 is about 373.0578030964.

The spelling of 51919247 in words is "fifty-one million, nine hundred nineteen thousand, two hundred forty-seven".