51078225 has 48 divisors (see below), whose sum is σ = 93190464. Its totient is φ = 24480000.

The previous prime is 51078211. The next prime is 51078227. The reversal of 51078225 is 52287015.

It is not a de Polignac number, because 51078225 - 2¹⁷ = 50947153 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51078192 and 51078201.

It is not an unprimeable number, because it can be changed into a prime (51078227) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 83019 + ... + 83631.

It is an arithmetic number, because the mean of its divisors is an integer number (1941468).

Almost surely, 2^51078225 is an apocalyptic number.

51078225 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51078225 is a deficient number, since it is larger than the sum of its proper divisors (42112239).

51078225 is a wasteful number, since it uses less digits than its factorization.

51078225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738 (or 733 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 51078225 is about 7146.9031755020. The cubic root of 51078225 is about 371.0324826314.

The spelling of 51078225 in words is "fifty-one million, seventy-eight thousand, two hundred twenty-five".