51320225 has 12 divisors (see below), whose sum is σ = 69422640. Its totient is φ = 37323600.

The previous prime is 51320207. The next prime is 51320237. The reversal of 51320225 is 52202315.

It is not a de Polignac number, because 51320225 - 2²⁰ = 50271649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51320197 and 51320206.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93035 + ... + 93584.

It is an arithmetic number, because the mean of its divisors is an integer number (5785220).

Almost surely, 2^51320225 is an apocalyptic number.

51320225 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51320225 is a deficient number, since it is larger than the sum of its proper divisors (18102415).

51320225 is a wasteful number, since it uses less digits than its factorization.

51320225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186640 (or 186635 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 51320225 is about 7163.8135793724. The cubic root of 51320225 is about 371.6175227328.

The spelling of 51320225 in words is "fifty-one million, three hundred twenty thousand, two hundred twenty-five".