51438225 has 24 divisors (see below), whose sum is σ = 89523040. Its totient is φ = 25989120.

The previous prime is 51438203. The next prime is 51438229. The reversal of 51438225 is 52283415.

It is not a de Polignac number, because 51438225 - 2⁶ = 51438161 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51438192 and 51438201.

It is not an unprimeable number, because it can be changed into a prime (51438229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16624 + ... + 19473.

Almost surely, 2^51438225 is an apocalyptic number.

It is an amenable number.

51438225 is a deficient number, since it is larger than the sum of its proper divisors (38084815).

51438225 is a wasteful number, since it uses less digits than its factorization.

51438225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36129 (or 36124 counting only the distinct ones).

The product of its digits is 9600, while the sum is 30.

The square root of 51438225 is about 7172.0446875351. The cubic root of 51438225 is about 371.9021233424.

The spelling of 51438225 in words is "fifty-one million, four hundred thirty-eight thousand, two hundred twenty-five".