51225732 has 18 divisors (see below), whose sum is σ = 129487358. Its totient is φ = 17075232.

The previous prime is 51225731. The next prime is 51225737. The reversal of 51225732 is 23752215.

It can be written as a sum of positive squares in only one way, i.e., 50893956 + 331776 = 7134^2 + 576^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 51225696 and 51225705.

It is not an unprimeable number, because it can be changed into a prime (51225731) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 711433 + ... + 711504.

Almost surely, 2^51225732 is an apocalyptic number.

It is an amenable number.

51225732 is an abundant number, since it is smaller than the sum of its proper divisors (78261626).

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

51225732 is a wasteful number, since it uses less digits than its factorization.

51225732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1422947 (or 1422942 counting only the distinct ones).

The product of its digits is 4200, while the sum is 27.

The square root of 51225732 is about 7157.2153802998. The cubic root of 51225732 is about 371.3893032310.

Adding to 51225732 its reverse (23752215), we get a palindrome (74977947).

It can be divided in two parts, 512 and 25732, that added together give a square (26244 = 162²).

The spelling of 51225732 in words is "fifty-one million, two hundred twenty-five thousand, seven hundred thirty-two".