251025040 has 60 divisors (see below), whose sum is σ = 678930876. Its totient is φ = 86064384.

The previous prime is 251025037. The next prime is 251025041. The reversal of 251025040 is 40520152.

It can be written as a sum of positive squares in 2 ways, for example, as 36578304 + 214446736 = 6048^2 + 14644^2 .

It is a junction number, because it is equal to n+sod(n) for n = 251024999 and 251025017.

It is not an unprimeable number, because it can be changed into a prime (251025041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28099 + ... + 35938.

Almost surely, 2^251025040 is an apocalyptic number.

251025040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251025040 is an abundant number, since it is smaller than the sum of its proper divisors (427905836).

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

251025040 is a wasteful number, since it uses less digits than its factorization.

251025040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64064 (or 64051 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 251025040 is about 15843.7697534394. The cubic root of 251025040 is about 630.8203305511.

Adding to 251025040 its reverse (40520152), we get a palindrome (291545192).

The spelling of 251025040 in words is "two hundred fifty-one million, twenty-five thousand, forty".