51782417 has 4 divisors (see below), whose sum is σ = 52130100. Its totient is φ = 51434736.

The previous prime is 51782413. The next prime is 51782443. The reversal of 51782417 is 71428715.

It is a Cunningham number, because it is equal to 7196²+1.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6071296 + 45711121 = 2464^2 + 6761^2 .

It is a cyclic number.

It is not a de Polignac number, because 51782417 - 2² = 51782413 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51782411) 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, 173618 + ... + 173915.

It is an arithmetic number, because the mean of its divisors is an integer number (13032525).

Almost surely, 2^51782417 is an apocalyptic number.

It is an amenable number.

51782417 is a deficient number, since it is larger than the sum of its proper divisors (347683).

51782417 is a wasteful number, since it uses less digits than its factorization.

51782417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347682.

The product of its digits is 15680, while the sum is 35.

The square root of 51782417 is about 7196.0000694830. Note that the first 4 decimals coincide. The cubic root of 51782417 is about 372.7297911012.

The spelling of 51782417 in words is "fifty-one million, seven hundred eighty-two thousand, four hundred seventeen".