251141540 has 48 divisors (see below), whose sum is σ = 586306560. Its totient is φ = 89735040.

The previous prime is 251141491. The next prime is 251141549. The reversal of 251141540 is 45141152.

It is a super-2 number, since 2×251141540² = 126144146227143200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (251141549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7520 + ... + 23639.

It is an arithmetic number, because the mean of its divisors is an integer number (12214720).

Almost surely, 2^251141540 is an apocalyptic number.

251141540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251141540 is an abundant number, since it is smaller than the sum of its proper divisors (335165020).

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

251141540 is a wasteful number, since it uses less digits than its factorization.

251141540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31212 (or 31210 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 251141540 is about 15847.4458509881. The cubic root of 251141540 is about 630.9179027594.

Adding to 251141540 its reverse (45141152), we get a palindrome (296282692).

The spelling of 251141540 in words is "two hundred fifty-one million, one hundred forty-one thousand, five hundred forty".