501331540 has 12 divisors (see below), whose sum is σ = 1052796276. Its totient is φ = 200532608.

The previous prime is 501331531. The next prime is 501331553. The reversal of 501331540 is 45133105.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 129458884 + 371872656 = 11378^2 + 19284^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12533269 + ... + 12533308.

It is an arithmetic number, because the mean of its divisors is an integer number (87733023).

Almost surely, 2^501331540 is an apocalyptic number.

It is an amenable number.

501331540 is an abundant number, since it is smaller than the sum of its proper divisors (551464736).

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

501331540 is a wasteful number, since it uses less digits than its factorization.

501331540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25066586 (or 25066584 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 501331540 is about 22390.4341181675. The cubic root of 501331540 is about 794.4044641378.

Adding to 501331540 its reverse (45133105), we get a palindrome (546464645).

The spelling of 501331540 in words is "five hundred one million, three hundred thirty-one thousand, five hundred forty".