251240125 has 8 divisors (see below), whose sum is σ = 313547832. Its totient is φ = 200992000.

The previous prime is 251240123. The next prime is 251240131. The reversal of 251240125 is 521042152.

It can be written as a sum of positive squares in 4 ways, for example, as 47692836 + 203547289 = 6906^2 + 14267^2 .

It is not a de Polignac number, because 251240125 - 2¹ = 251240123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 251240096 and 251240105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251240123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1004836 + ... + 1005085.

It is an arithmetic number, because the mean of its divisors is an integer number (39193479).

Almost surely, 2^251240125 is an apocalyptic number.

251240125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

251240125 is a deficient number, since it is larger than the sum of its proper divisors (62307707).

251240125 is an equidigital number, since it uses as much as digits as its factorization.

251240125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2009936 (or 2009926 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 251240125 is about 15850.5559839395. Note that the first 3 decimals coincide. The cubic root of 251240125 is about 631.0004470550. Note that the first 3 decimals are identical.

Adding to 251240125 its reverse (521042152), we get a palindrome (772282277).

The spelling of 251240125 in words is "two hundred fifty-one million, two hundred forty thousand, one hundred twenty-five".