51225132 has 48 divisors (see below), whose sum is σ = 137168640. Its totient is φ = 14574912.

The previous prime is 51225067. The next prime is 51225143. The reversal of 51225132 is 23152215.

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 = 51225099 and 51225108.

It is an unprimeable number.

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, 21463 + ... + 23729.

It is an arithmetic number, because the mean of its divisors is an integer number (2857680).

Almost surely, 2^51225132 is an apocalyptic number.

It is an amenable number.

51225132 is an abundant number, since it is smaller than the sum of its proper divisors (85943508).

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

51225132 is a wasteful number, since it uses less digits than its factorization.

51225132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2550 (or 2548 counting only the distinct ones).

The product of its digits is 600, while the sum is 21.

The square root of 51225132 is about 7157.1734644341. The cubic root of 51225132 is about 371.3878532146.

Adding to 51225132 its reverse (23152215), we get a palindrome (74377347).

The spelling of 51225132 in words is "fifty-one million, two hundred twenty-five thousand, one hundred thirty-two".