521144140 has 48 divisors (see below), whose sum is σ = 1206251424. Its totient is φ = 187545600.

The previous prime is 521144101. The next prime is 521144159. The reversal of 521144140 is 41441125.

It is a Harshad number since it is a multiple of its sum of digits (22).

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, 9130 + ... + 33550.

It is an arithmetic number, because the mean of its divisors is an integer number (25130238).

Almost surely, 2^521144140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521144140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (603125712).

521144140 is an abundant number, since it is smaller than the sum of its proper divisors (685107284).

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

521144140 is a wasteful number, since it uses less digits than its factorization.

521144140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24538 (or 24536 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 521144140 is about 22828.5816466989. The cubic root of 521144140 is about 804.7344983000.

Adding to 521144140 its reverse (41441125), we get a palindrome (562585265).

It can be divided in two parts, 521144 and 140, that added together give a square (521284 = 722²).

The spelling of 521144140 in words is "five hundred twenty-one million, one hundred forty-four thousand, one hundred forty".