251140525 has 12 divisors (see below), whose sum is σ = 313001172. Its totient is φ = 199888640.

The previous prime is 251140523. The next prime is 251140559. The reversal of 251140525 is 525041152.

It can be written as a sum of positive squares in 6 ways, for example, as 6874884 + 244265641 = 2622^2 + 15629^2 .

It is not a de Polignac number, because 251140525 - 2¹ = 251140523 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 251140525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251140523) 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, 20572 + ... + 30421.

It is an arithmetic number, because the mean of its divisors is an integer number (26083431).

Almost surely, 2^251140525 is an apocalyptic number.

251140525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

251140525 is a deficient number, since it is larger than the sum of its proper divisors (61860647).

251140525 is a wasteful number, since it uses less digits than its factorization.

251140525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51200 (or 51195 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 251140525 is about 15847.4138268678. The cubic root of 251140525 is about 630.9170527971.

Adding to 251140525 its reverse (525041152), we get a palindrome (776181677).

The spelling of 251140525 in words is "two hundred fifty-one million, one hundred forty thousand, five hundred twenty-five".