51778249 has 8 divisors (see below), whose sum is σ = 54609440. Its totient is φ = 48957696.

The previous prime is 51778247. The next prime is 51778261. The reversal of 51778249 is 94287715.

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

It is a cyclic number.

It is not a de Polignac number, because 51778249 - 2¹ = 51778247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51778247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8602 + ... + 13324.

It is an arithmetic number, because the mean of its divisors is an integer number (6826180).

Almost surely, 2^51778249 is an apocalyptic number.

It is an amenable number.

51778249 is a deficient number, since it is larger than the sum of its proper divisors (2831191).

51778249 is a wasteful number, since it uses less digits than its factorization.

51778249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5319.

The product of its digits is 141120, while the sum is 43.

The square root of 51778249 is about 7195.7104583217. The cubic root of 51778249 is about 372.7197904128.

The spelling of 51778249 in words is "fifty-one million, seven hundred seventy-eight thousand, two hundred forty-nine".