251289140 has 24 divisors (see below), whose sum is σ = 534068640. Its totient is φ = 99303968.

The previous prime is 251289139. The next prime is 251289149. The reversal of 251289140 is 41982152.

It is a junction number, because it is equal to n+sod(n) for n = 251289097 and 251289106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251289149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74030 + ... + 77349.

It is an arithmetic number, because the mean of its divisors is an integer number (22252860).

Almost surely, 2^251289140 is an apocalyptic number.

251289140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251289140 is an abundant number, since it is smaller than the sum of its proper divisors (282779500).

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

251289140 is a wasteful number, since it uses less digits than its factorization.

251289140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151471 (or 151469 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 251289140 is about 15852.1020688109. The cubic root of 251289140 is about 631.0414788181.

The spelling of 251289140 in words is "two hundred fifty-one million, two hundred eighty-nine thousand, one hundred forty".