51120342 has 128 divisors (see below), whose sum is σ = 142571520. Its totient is φ = 13219200.

The previous prime is 51120341. The next prime is 51120353. The reversal of 51120342 is 24302115.

It is a super-2 number, since 2×51120342² = 5226578732393928, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51120341) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 496263 + ... + 496365.

It is an arithmetic number, because the mean of its divisors is an integer number (1113840).

Almost surely, 2^51120342 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51120342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71285760).

51120342 is an abundant number, since it is smaller than the sum of its proper divisors (91451178).

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

51120342 is a wasteful number, since it uses less digits than its factorization.

51120342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 51120342 is about 7149.8490893165. The cubic root of 51120342 is about 371.1344339814.

Adding to 51120342 its reverse (24302115), we get a palindrome (75422457).

The spelling of 51120342 in words is "fifty-one million, one hundred twenty thousand, three hundred forty-two".