251065530 has 24 divisors (see below), whose sum is σ = 652770612. Its totient is φ = 66950784.

The previous prime is 251065523. The next prime is 251065531. The reversal of 251065530 is 35560152.

251065530 is a `hidden beast` number, since 2 + 5 + 1 + 0 + 655 + 3 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 244578321 + 6487209 = 15639^2 + 2547^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 251065494 and 251065503.

It is not an unprimeable number, because it can be changed into a prime (251065531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1394719 + ... + 1394898.

Almost surely, 2^251065530 is an apocalyptic number.

251065530 is an abundant number, since it is smaller than the sum of its proper divisors (401705082).

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

251065530 is a wasteful number, since it uses less digits than its factorization.

251065530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2789630 (or 2789627 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 251065530 is about 15845.0474912510. The cubic root of 251065530 is about 630.8542455502.

The spelling of 251065530 in words is "two hundred fifty-one million, sixty-five thousand, five hundred thirty".