51706225 has 6 divisors (see below), whose sum is σ = 64115750. Its totient is φ = 41364960.

The previous prime is 51706199. The next prime is 51706229. The reversal of 51706225 is 52260715.

It can be written as a sum of positive squares in 3 ways, for example, as 2313441 + 49392784 = 1521^2 + 7028^2 .

It is not a de Polignac number, because 51706225 - 2⁷ = 51706097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51706193 and 51706202.

It is not an unprimeable number, because it can be changed into a prime (51706229) 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, 1034100 + ... + 1034149.

Almost surely, 2^51706225 is an apocalyptic number.

It is an amenable number.

51706225 is a deficient number, since it is larger than the sum of its proper divisors (12409525).

51706225 is a wasteful number, since it uses less digits than its factorization.

51706225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2068259 (or 2068254 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 51706225 is about 7190.7040684484. The cubic root of 51706225 is about 372.5468913838.

The spelling of 51706225 in words is "fifty-one million, seven hundred six thousand, two hundred twenty-five".