51550242 has 16 divisors (see below), whose sum is σ = 104047680. Its totient is φ = 17025552.

The previous prime is 51550237. The next prime is 51550259. The reversal of 51550242 is 24205515.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38758 + ... + 40065.

It is an arithmetic number, because the mean of its divisors is an integer number (6502980).

Almost surely, 2^51550242 is an apocalyptic number.

51550242 is an abundant number, since it is smaller than the sum of its proper divisors (52497438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51550242 is a wasteful number, since it uses less digits than its factorization.

51550242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78937.

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 51550242 is about 7179.8497198758. The cubic root of 51550242 is about 372.1718913094.

Adding to 51550242 its reverse (24205515), we get a palindrome (75755757).

The spelling of 51550242 in words is "fifty-one million, five hundred fifty thousand, two hundred forty-two".