51271542 has 72 divisors (see below), whose sum is σ = 134073576. Its totient is φ = 14642208.

The previous prime is 51271513. The next prime is 51271543. The reversal of 51271542 is 24517215.

51271542 is a `hidden beast` number, since 51 + 2 + 71 + 542 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51271543) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 22738 + ... + 24890.

It is an arithmetic number, because the mean of its divisors is an integer number (1862133).

Almost surely, 2^51271542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51271542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67036788).

51271542 is an abundant number, since it is smaller than the sum of its proper divisors (82802034).

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

51271542 is a wasteful number, since it uses less digits than its factorization.

51271542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2184 (or 2165 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 51271542 is about 7160.4149321111. The cubic root of 51271542 is about 371.4999785647.

Adding to 51271542 its reverse (24517215), we get a palindrome (75788757).

The spelling of 51271542 in words is "fifty-one million, two hundred seventy-one thousand, five hundred forty-two".