51281742 has 16 divisors (see below), whose sum is σ = 102863232. Its totient is φ = 17043960.

The previous prime is 51281717. The next prime is 51281771. The reversal of 51281742 is 24718215.

It is a congruent 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, 10234 + ... + 14397.

It is an arithmetic number, because the mean of its divisors is an integer number (6428952).

Almost surely, 2^51281742 is an apocalyptic number.

51281742 is an abundant number, since it is smaller than the sum of its proper divisors (51581490).

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

51281742 is a wasteful number, since it uses less digits than its factorization.

51281742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24983.

The product of its digits is 4480, while the sum is 30.

The square root of 51281742 is about 7161.1271459177. The cubic root of 51281742 is about 371.5246124284.

Adding to 51281742 its reverse (24718215), we get a palindrome (75999957).

The spelling of 51281742 in words is "fifty-one million, two hundred eighty-one thousand, seven hundred forty-two".