51211142 has 4 divisors (see below), whose sum is σ = 76816716. Its totient is φ = 25605570.

The previous prime is 51211117. The next prime is 51211159. The reversal of 51211142 is 24111215.

51211142 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a self number, because there is not a number n which added to its sum of digits gives 51211142.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12802784 + ... + 12802787.

It is an arithmetic number, because the mean of its divisors is an integer number (19204179).

Almost surely, 2^51211142 is an apocalyptic number.

51211142 is a deficient number, since it is larger than the sum of its proper divisors (25605574).

51211142 is a wasteful number, since it uses less digits than its factorization.

51211142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25605573.

The product of its digits is 80, while the sum is 17.

The square root of 51211142 is about 7156.1960565652. The cubic root of 51211142 is about 371.3540404556.

Adding to 51211142 its reverse (24111215), we get a palindrome (75322357).

The spelling of 51211142 in words is "fifty-one million, two hundred eleven thousand, one hundred forty-two".