51601725 has 96 divisors (see below), whose sum is σ = 110627840. Its totient is φ = 23094720.

The previous prime is 51601721. The next prime is 51601741. The reversal of 51601725 is 52710615.

51601725 is a `hidden beast` number, since 51 + 601 + 7 + 2 + 5 = 666.

51601725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51601725 - 2² = 51601721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51601721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 316494 + ... + 316656.

Almost surely, 2^51601725 is an apocalyptic number.

It is an amenable number.

51601725 is an abundant number, since it is smaller than the sum of its proper divisors (59026115).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51601725 is a wasteful number, since it uses less digits than its factorization.

51601725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256 (or 245 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 51601725 is about 7183.4340673525. The cubic root of 51601725 is about 372.2957455648.

It can be divided in two parts, 51601 and 725, that added together give a triangular number (52326 = T₃₂₃).

The spelling of 51601725 in words is "fifty-one million, six hundred one thousand, seven hundred twenty-five".