51321032 has 64 divisors (see below), whose sum is σ = 114480000. Its totient is φ = 21553728.

The previous prime is 51320999. The next prime is 51321037. The reversal of 51321032 is 23012315.

It is a self number, because there is not a number n which added to its sum of digits gives 51321032.

It is not an unprimeable number, because it can be changed into a prime (51321037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161738 + ... + 162054.

It is an arithmetic number, because the mean of its divisors is an integer number (1788750).

Almost surely, 2^51321032 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51321032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57240000).

51321032 is an abundant number, since it is smaller than the sum of its proper divisors (63158968).

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

51321032 is a wasteful number, since it uses less digits than its factorization.

51321032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 51321032 is about 7163.8699038997. The cubic root of 51321032 is about 371.6194705924.

Adding to 51321032 its reverse (23012315), we get a palindrome (74333347).

The spelling of 51321032 in words is "fifty-one million, three hundred twenty-one thousand, thirty-two".