251012140 has 48 divisors (see below), whose sum is σ = 560649600. Its totient is φ = 94072832.

The previous prime is 251012119. The next prime is 251012147. The reversal of 251012140 is 41210152.

251012140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (251012147) 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, 79716 + ... + 82804.

It is an arithmetic number, because the mean of its divisors is an integer number (11680200).

Almost surely, 2^251012140 is an apocalyptic number.

251012140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251012140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280324800).

251012140 is an abundant number, since it is smaller than the sum of its proper divisors (309637460).

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

251012140 is a wasteful number, since it uses less digits than its factorization.

251012140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3354 (or 3352 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 251012140 is about 15843.3626481249. The cubic root of 251012140 is about 630.8095245618.

Adding to 251012140 its reverse (41210152), we get a palindrome (292222292).

It can be divided in two parts, 251012 and 140, that added together give a palindrome (251152).

The spelling of 251012140 in words is "two hundred fifty-one million, twelve thousand, one hundred forty".