51388025 has 48 divisors (see below), whose sum is σ = 74245248. Its totient is φ = 34944000.

The previous prime is 51388021. The next prime is 51388031. The reversal of 51388025 is 52088315.

It is a happy number.

It is not a de Polignac number, because 51388025 - 2² = 51388021 is a prime.

It is a super-2 number, since 2×51388025² = 5281458226801250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51387982 and 51388000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51388021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 392210 + ... + 392340.

It is an arithmetic number, because the mean of its divisors is an integer number (1546776).

Almost surely, 2^51388025 is an apocalyptic number.

It is an amenable number.

51388025 is a deficient number, since it is larger than the sum of its proper divisors (22857223).

51388025 is a wasteful number, since it uses less digits than its factorization.

51388025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 51388025 is about 7168.5441339229. The cubic root of 51388025 is about 371.7811007420.

The spelling of 51388025 in words is "fifty-one million, three hundred eighty-eight thousand, twenty-five".