51205142 has 8 divisors (see below), whose sum is σ = 76839096. Its totient is φ = 25592112.

The previous prime is 51205127. The next prime is 51205163. The reversal of 51205142 is 24150215.

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

It is a congruent number.

It is an unprimeable number.

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, 4538 + ... + 11090.

It is an arithmetic number, because the mean of its divisors is an integer number (9604887).

Almost surely, 2^51205142 is an apocalyptic number.

51205142 is a deficient number, since it is larger than the sum of its proper divisors (25633954).

51205142 is a wasteful number, since it uses less digits than its factorization.

51205142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10462.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 51205142 is about 7155.7768271516. The cubic root of 51205142 is about 371.3395370280.

Adding to 51205142 its reverse (24150215), we get a palindrome (75355357).

The spelling of 51205142 in words is "fifty-one million, two hundred five thousand, one hundred forty-two".