51210142 has 4 divisors (see below), whose sum is σ = 76815216. Its totient is φ = 25605070.

The previous prime is 51210113. The next prime is 51210151. The reversal of 51210142 is 24101215.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12802534 + ... + 12802537.

It is an arithmetic number, because the mean of its divisors is an integer number (19203804).

Almost surely, 2^51210142 is an apocalyptic number.

51210142 is a deficient number, since it is larger than the sum of its proper divisors (25605074).

51210142 is a wasteful number, since it uses less digits than its factorization.

51210142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25605073.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 51210142 is about 7156.1261867019. The cubic root of 51210142 is about 371.3516232963.

Adding to 51210142 its reverse (24101215), we get a palindrome (75311357).

The spelling of 51210142 in words is "fifty-one million, two hundred ten thousand, one hundred forty-two".