51322142 has 4 divisors (see below), whose sum is σ = 76983216. Its totient is φ = 25661070.

The previous prime is 51322087. The next prime is 51322157. The reversal of 51322142 is 24122315.

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, 12830534 + ... + 12830537.

It is an arithmetic number, because the mean of its divisors is an integer number (19245804).

Almost surely, 2^51322142 is an apocalyptic number.

51322142 is a deficient number, since it is larger than the sum of its proper divisors (25661074).

51322142 is a wasteful number, since it uses less digits than its factorization.

51322142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25661073.

The product of its digits is 480, while the sum is 20.

The square root of 51322142 is about 7163.9473755744. The cubic root of 51322142 is about 371.6221497710.

Adding to 51322142 its reverse (24122315), we get a palindrome (75444457).

The spelling of 51322142 in words is "fifty-one million, three hundred twenty-two thousand, one hundred forty-two".