51603132 has 96 divisors (see below), whose sum is σ = 143119872. Its totient is φ = 14167296.

The previous prime is 51603131. The next prime is 51603137. The reversal of 51603132 is 23130615.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 51603099 and 51603108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51603131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 298198 + ... + 298370.

It is an arithmetic number, because the mean of its divisors is an integer number (1490832).

Almost surely, 2^51603132 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 51603132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71559936).

51603132 is an abundant number, since it is smaller than the sum of its proper divisors (91516740).

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

51603132 is a wasteful number, since it uses less digits than its factorization.

51603132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307 (or 305 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 51603132 is about 7183.5320003463. The cubic root of 51603132 is about 372.2991292718.

Adding to 51603132 its reverse (23130615), we get a palindrome (74733747).

The spelling of 51603132 in words is "fifty-one million, six hundred three thousand, one hundred thirty-two".