51205125 has 16 divisors (see below), whose sum is σ = 85205952. Its totient is φ = 27309200.

The previous prime is 51205117. The next prime is 51205127. The reversal of 51205125 is 52150215.

It is not a de Polignac number, because 51205125 - 2³ = 51205117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51205127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67899 + ... + 68648.

It is an arithmetic number, because the mean of its divisors is an integer number (5325372).

Almost surely, 2^51205125 is an apocalyptic number.

It is an amenable number.

51205125 is a deficient number, since it is larger than the sum of its proper divisors (34000827).

51205125 is a wasteful number, since it uses less digits than its factorization.

51205125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136565 (or 136555 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 51205125 is about 7155.7756393000. The cubic root of 51205125 is about 371.3394959333.

The spelling of 51205125 in words is "fifty-one million, two hundred five thousand, one hundred twenty-five".