251451231140 has 24 divisors (see below), whose sum is σ = 542319143352. Its totient is φ = 97862100480.

The previous prime is 251451231139. The next prime is 251451231169. The reversal of 251451231140 is 41132154152.

It is a happy number.

251451231140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 101485570624 + 149965660516 = 318568^2 + 387254^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169898741 + ... + 169900220.

It is an arithmetic number, because the mean of its divisors is an integer number (22596630973).

Almost surely, 2^251451231140 is an apocalyptic number.

251451231140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251451231140 is an abundant number, since it is smaller than the sum of its proper divisors (290867912212).

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

251451231140 is a wasteful number, since it uses less digits than its factorization.

251451231140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339799007 (or 339799005 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 251451231140 its reverse (41132154152), we get a palindrome (292583385292).

The spelling of 251451231140 in words is "two hundred fifty-one billion, four hundred fifty-one million, two hundred thirty-one thousand, one hundred forty".