251232540 has 48 divisors (see below), whose sum is σ = 757565088. Its totient is φ = 61841664.

The previous prime is 251232517. The next prime is 251232559. The reversal of 251232540 is 45232152.

251232540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 251232540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160267 + ... + 161826.

It is an arithmetic number, because the mean of its divisors is an integer number (15782606).

Almost surely, 2^251232540 is an apocalyptic number.

251232540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251232540 is an abundant number, since it is smaller than the sum of its proper divisors (506332548).

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

251232540 is a wasteful number, since it uses less digits than its factorization.

251232540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322118 (or 322116 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 251232540 is about 15850.3167160786. The cubic root of 251232540 is about 630.9940969725.

Adding to 251232540 its reverse (45232152), we get a palindrome (296464692).

The spelling of 251232540 in words is "two hundred fifty-one million, two hundred thirty-two thousand, five hundred forty".