51242241 has 4 divisors (see below), whose sum is σ = 68322992. Its totient is φ = 34161492.

The previous prime is 51242237. The next prime is 51242273. The reversal of 51242241 is 14224215.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51242241 - 2² = 51242237 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51242201) 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 3 ways as a sum of consecutive naturals, for example, 8540371 + ... + 8540376.

It is an arithmetic number, because the mean of its divisors is an integer number (17080748).

Almost surely, 2^51242241 is an apocalyptic number.

It is an amenable number.

51242241 is a deficient number, since it is larger than the sum of its proper divisors (17080751).

51242241 is a wasteful number, since it uses less digits than its factorization.

51242241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17080750.

The product of its digits is 640, while the sum is 21.

The square root of 51242241 is about 7158.3685990594. The cubic root of 51242241 is about 371.4291959908.

Adding to 51242241 its reverse (14224215), we get a palindrome (65466456).

The spelling of 51242241 in words is "fifty-one million, two hundred forty-two thousand, two hundred forty-one".