51135825 has 48 divisors (see below), whose sum is σ = 91869120. Its totient is φ = 24948480.

The previous prime is 51135823. The next prime is 51135827. The reversal of 51135825 is 52853115.

It is an interprime number because it is at equal distance from previous prime (51135823) and next prime (51135827).

It is not a de Polignac number, because 51135825 - 2¹ = 51135823 is a prime.

It is a super-2 number, since 2×51135825² = 5229745196861250, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51135792 and 51135801.

It is not an unprimeable number, because it can be changed into a prime (51135823) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 174379 + ... + 174671.

It is an arithmetic number, because the mean of its divisors is an integer number (1913940).

Almost surely, 2^51135825 is an apocalyptic number.

It is an amenable number.

51135825 is a deficient number, since it is larger than the sum of its proper divisors (40733295).

51135825 is a wasteful number, since it uses less digits than its factorization.

51135825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498 (or 493 counting only the distinct ones).

The product of its digits is 6000, while the sum is 30.

The square root of 51135825 is about 7150.9317574705. The cubic root of 51135825 is about 371.1718991350.

The spelling of 51135825 in words is "fifty-one million, one hundred thirty-five thousand, eight hundred twenty-five".