51540125 has 64 divisors (see below), whose sum is σ = 83026944. Its totient is φ = 31046400.

The previous prime is 51540121. The next prime is 51540161. The reversal of 51540125 is 52104515.

It is a happy number.

It is not a de Polignac number, because 51540125 - 2² = 51540121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a self number, because there is not a number n which added to its sum of digits gives 51540125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51540121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 261527 + ... + 261723.

It is an arithmetic number, because the mean of its divisors is an integer number (1297296).

Almost surely, 2^51540125 is an apocalyptic number.

It is an amenable number.

51540125 is a deficient number, since it is larger than the sum of its proper divisors (31486819).

51540125 is a wasteful number, since it uses less digits than its factorization.

51540125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 245 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 51540125 is about 7179.1451440962. The cubic root of 51540125 is about 372.1475428342.

It can be divided in two parts, 5 and 1540125, that multiplied together give a square (7700625 = 2775²).

The spelling of 51540125 in words is "fifty-one million, five hundred forty thousand, one hundred twenty-five".