51708242 has 4 divisors (see below), whose sum is σ = 77562366. Its totient is φ = 25854120.

The previous prime is 51708233. The next prime is 51708281. The reversal of 51708242 is 24280715.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24280715 = 5 ⋅4856143.

It can be written as a sum of positive squares in only one way, i.e., 47623801 + 4084441 = 6901^2 + 2021^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12927059 + ... + 12927062.

Almost surely, 2^51708242 is an apocalyptic number.

51708242 is a deficient number, since it is larger than the sum of its proper divisors (25854124).

51708242 is a wasteful number, since it uses less digits than its factorization.

51708242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25854123.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 51708242 is about 7190.8443176028. The cubic root of 51708242 is about 372.5517355286.

Adding to 51708242 its reverse (24280715), we get a palindrome (75988957).

The spelling of 51708242 in words is "fifty-one million, seven hundred eight thousand, two hundred forty-two".